m chia 8 dư mấy biết m=71+[72+73]+[74+75]
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
VT
2
12 tháng 11 2021
M = 7 + 72 + 73 + 74 + ..... + 7100
M = 7+(1+7)+73+(1+7)+...+799+(1+7)
M = 7x8+73x8+...+799x8
M = 8x(7+73+...+799)
mà 8 chia hết 8 => 8(7+73+...+799) chia hết 8
Vậy M chia hết cho 8
PB
4
16 tháng 9 2018
71 + 72 + 73 + 74 + 75 + 76 + 77 + 78 + 79
= ( 71 + 79 ) + ( 72 + 78 ) + ( 73 + 77 ) + ( 74 + 76 ) + 75
= 150 + 150 + 150 + 150 + 75
= 150 x 4 + 75
= 600 + 75
= 675
Tìm x :
X x 7 + X x 2 = 108
X x ( 7 + 2 ) = 108
X x 9 = 108
X = 108 : 9
X = 12
16 tháng 9 2018
\(71+72+73+74+75+76+77+78+79\)
\(=\left(71+79\right)+\left(72+78\right)+\left(73+77\right)+\left(74+76\right)+75\)
\(=150+150+150+150+75\)
\(=600+75\)
\(=675\)
\(X\)x\(7+X\)x\(2=108\)
\(X\)x\(\left(7+2\right)=108\)
\(X\)x\(9=108\)
\(X=108:9\)
\(X=12\)
Vậy \(X=12\)
KY
14 tháng 7 2021
70. Everybody is here now, ___aren't they_______?
71. There is nothing wrong, _____isn't there_____?
72. Mike mustn’t come late, ____must he______?
73. She is collecting stamps, ____isn't she______?
74. They often watch TV in the afternoon, ______don't they____?
75. David has cleaned your bike, ____hasn't he______?
76. John and Max don't like Maths, ____do they______?
77. Peter played handball yesterday, ______didn't he____?
78. Mary didn't do her homework last Monday, ____did she______?
79. Lewis could have bought a new car, ______couldn't he____?
80. The train is arriving on time, ____isn't it______?
81. Kevin spent all his money yesterday, ____didn't he______?
82. He had hardly left the office when the telephone rang, _____hadn't he_____?
83. Max'd better stay here for a week, ____shouldn't he______?
84. Nothing was damaged during the storm, ______was it____?
85. Mrs. Black doesn't believe her son is able to draw such a picture, _____does she_____?
86. He comes late sometimes, ____doesn't he______?
87. He failed to do anything last weekend, ____didn't he______?
88. The Smiths hardly ever go on travel, __does they______?
89. Jack and Jill went up the hill, ____don't they______?
90. There are seven days in a week, ________aren't there__?
15 tháng 8 2023
71. Does she like an apples?
72. I usually have lunch at 12.00.
73. He can swimming but i can't swimming.
74. At the moment my sister is reading a comic book.
75. I like ice-cream.
RH
2
27 tháng 9 2016
B = 74 - 73 + 72 - 71 +.................+2 - 1
B = 1 + 1 + ... + 1
mà có 37 số 1
B = 1 x 37
=> B = 37
9 tháng 4 2021
71. The Olympic Games are the international events which take place every four years in different cities.
72. Taxi is difficult to get during rush hour.
73. Can ditionaries be used by students?
74. I am used to getting up early to learn English.
75. Television progams are interesting to watch.
76. After they had carried the Olympic torch into the stadium, games began.
77. When I got to the theater, the movie had already started.
78. How long have you learnt English?
79. The girl whose parents live in Hanoi invited me to spend my summer holidays there.
I0. The man who is in black uniform is the referee.
81. Try to use your goods as economically as you can.
82. It is one of the most expensive cars in the world.
83. The games are not exciting enough to attract many children.
84. Mr. Nam is said to be a famous doctor.
85. He is not intelligent enough to understand what you say.
Ta có
71+(72+73)+(74+75)
=7+72(7+1)+74(7+1)
=7+72.8+74.8
Vì 72.8 chia hết cho 8
74.8 chia hết cho 8
7 chia 8 dư 7
⇒7+72.8+74.8 chia 8 dư 7
⇒m chia 8 dư 7