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24 tháng 2 2020

Bạn dùng phép đặt tính thẳng hàng và suy luận:

-Xét hàng đầu với hàng cuối với trường hợp a+d không có nhớ

a+d=c (1)và 8+c=d(2)

Thay (2) vào (1), ta có:

a+8+c=c(vô lý)

Vậy suy ra a+d cho kết quả có nhớ bằng 1.

- Xét hàng thứ hai từ phải sang b+6=2 và theo ý trên đã nhớ 1 nên b=5 và kết quả này tiếp tục nhớ 1

- Xét hàng thứ ba từ phải sang a+2=5 và theo ý trên thì a=2(lần này không có số nhớ)

- Giờ cùng xét hàng cuối với a+d=c hay 2+d=c. Như đã lập luận trường hợp này chỉ có thể là nhớ 1. Vậy trường hợp d có thể htoar mãn điều kiện chỉ có thể là 8 hoặc 9.

+ Xét trường hợp d=8 thì a+d=2+8=10, suy ra c=0 và hàng đầu tiên từ trái sang sẽ cho kết quả là 8+c=d hay 8+0=8(thỏa mãn)

+Xét trường hợp d=9 thì a+d=2+9=11, suy ra c=1 và hàng đầu tiên từ trái sang sẽ cho kết quả là 8+c=d hay 8+1=9(thỏa mãn)

Vậy a=2,b=5,c=1 hoặc 0 và d=8 hoặc 9

21 tháng 11 2019

A. Câu hỏi của nguyenthichi - Toán lớp 6 - Học toán với OnlineMath

28 tháng 1 2019

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28 tháng 1 2019

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51.Look! The new lorry enters the factory to carry the cargo.            A                                B                       C                 D52. The windows look dirty. They need to be cleaning.A                   B                         C                  D53. I haveknown him since 5 years.        A         ...
Đọc tiếp

51.Look! The new lorry enters the factory to carry the cargo.   

         A                                B                       C                 D

52. The windows look dirty. They need to be cleaning.
A                   B                         C                  D
53. I haveknown him since 5 years.

        A          B                 C        D

54. Please don’tmake so much noise. I study.

                   A       B             C                    D

55. The driver of the car was seriousinjured.

       A              B                         C         D

56. There is so manyinformation in this dictionary.

        A                B            C                            D

57. “Can youplay guitar?” —“Yes, I can.”

                 A         B                     C      D

58. Your writingis terrible. I can’t never read it.

  A           B                      C                   D

59. We hada very good weatherwhen we were on holiday.

          A                     B                    C                  D

60. You don’t haveacigarette, will you?

                          A     B        C            D

1
10 tháng 4 2022

D

C

D

C

A

D

A

D

51. Look! The new lorry enters the factory to carry the cargo.            A                                B                       C                 D52. The windows look dirty. They need to be cleaning.        A                   B                         C                  D53. I have known him since 5 years.        A         ...
Đọc tiếp

51. Look! The new lorry enters the factory to carry the cargo.   

         A                                B                       C                 D

52. The windows look dirty. They need to be cleaning.
        A                   B                         C                  D
53. I have known him since 5 years.

        A          B                 C        D

54. Please don’t make so much noise. I study.

                    A       B            C                    D

55. The driver of the car was serious injured.

       A              B                         C         D

56. There is so many information in this dictionary.

        A                B            C                            D

57. “Can you play guitar?” —“Yes, I can.”

                 A         B                     C      D

58. Your writing is terrible. I can’t never read it.

  A           B                      C                   D

59. We had a very good weather when we were on holiday.

          A                     B                    C                  D

60. You don’t have   a  cigarette, will you?

                          A     B        C            D

61. What did you do at 8 .00 last night? I phoned you but no one answered.

                       A                           B                C                       D

62. They are going to have to leave soon and so do we.

                A                      B                 C                D

63. You're tired although you stayed up too late to watch TV last night.
       A                  B                    C                          D

64. Tuan sighed sad when he heard that he failed the test.
                 A         B                           C         D

65. Don't speak English with him; he hardly not know any English.
        A                                B                      C                 D

66. 90 percent of earthquakes occurs around the Pacific Rim.
                       A         B            C                     D

67. I have been in England during the spring of 1989.

                A      B                                 C         D

68.The bus was crowded with passengers. So, he had to stand all the way.

                            A           B                        C                                 D

69. The car stopped for the children whom were waiting to cross the road.

                                A                          B              C               D

70.Let’s have a picnic on the beach, shan’t we?

         A     B                       C                   D

71.The reason which I haven’t to Hawaii is that I can’t afford it.

                           A                    B                  C         D                          

72. Mary said that she didn’t want to buy these books because she didn’t

                                    A                                                 B                 C

money enough with her.

             D

73. Jim said that he was playing the piano in the hall now .

         A                         B                                 C          D

74. What about play tennis in stead of going to the cinema ?               

               A               B               C             D

75. After finish their homework , they took a long bath and went to bed .

           A                                          B                       C                D

76. Both teenagers and adults feel like help poor people, don’t they?

                               A                 B        C                             D

77. She fed up about living in remote areas without electricity.

               A       B                       C                                  D

78. They were swimming in the ocean when the storm occurs.

        A                                      B                         C              D

79. Who will look for your business affairs while you are away?

                          A                           B             C              D

80. I bought   a computer which screen was not very good .

           A                  B           C                 D

81. We ought bring along a raincoat , I think it’s going to rain 

                  A                           B                          C               D

82. There are so many chicken in the garden that I can’t count them all .

                        A              B                 C                                      D

83. What about  play tennis in stead of going to the cinema?

             A                         B                  C                 D

84. Stay in bed all day is not good for our health , isn’t it ?

        A                B                          C                          D

85. You know , the room is so tidy that it need clean without delay .

             A                               B                            C            D

86. You can see that the room has been beautiful decorated for Christmas .

                 A                       B                        C                                  D

87. Jill and Eric had all their money stealing while they were on holiday .

                                  A             B           C                                 D

88. I rarely eat ice-cream now , but I use to eat when I was a child .

           A                                              B               C        D

89. If I have been hungry, I would  have eaten something .

              A                             B                    C          D

90. James had to get used to drive on the left .

                   A             B           C           D

91. What do you do if you lost your passport ?

                A             B                  C        D

92. Mr. Miller doesn’t  likes  being kept waiting .

                              A       B      C                 D

93. A dog should be checked regular by a veterinarian to ensure that it

                          A                       B                                       C                                                          

remains in good health

                               D

94. Unless you do better work than this , you will pass the exam .

                         A               B           C                  D

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