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13 tháng 10 2019
= 31+2+3+...+99
=399+98+97+....+1
=3(99+1)+(98+2)+...+(1+99) (Hiểu ở đây có 99 cặp)
=3100+100+...+100
= 3100.99
=39900
=39900:2
=34950
Chả bt có đứa nào lm giống mk ko nx. k giúp mk nha:))
GT
3
W
17 tháng 2 2020
Từ biểu thức, suy ra:
(x+1)2=0
Thay x=-1:
(-1+1)2=0
02=0(hợp lý)
Vậy phương trình có nghiệm x=-1 duy nhất
TC
22 tháng 3 2021
1 Not until Tom received the job offer in writing did he celebrate
2 There has been a 10% increase in the number of students applying to this university
3 The manager is believed to have absconded with the company's pension fund money
4 You pay in 12 sucesstive months of $20 each
5 You needn’t have gone to so much trouble on my behalf.
22 tháng 3 2021
1, Not until Tom received the job offer in writing did he celebrate
2, There has been a 10% increase in the number of students applying to this university
3 ,The manager is believed to have absconded with the company's pension fund money
4 ,You pay in 12 sucesstive months of $20 each
5, You needn’t have gone to so much trouble on my behalf.
TC
31 tháng 3 2021
1 What is Mary's adress?
2 The red dress is not as cheap as the blue one hoặc the red dress is more expensive than the blue one
3 Nam always tries to learn English so that he could get a good job
5 tháng 7 2021
1 . What is your favourite sport ?
2 . Tim doesn't play football as well as Mark does
3 . Beckham played football very well
4 . When did you start playing basketball ?
5 . How about playing badminton this weekend ?
6 . Football is the most popular sport in Britain
7 . I am more interested in basketball than my brother
8 . You should do morning exercise regularly
5 tháng 7 2021
1.What sports do you best ?
=> What is your favourite sports ?
2.Mark plays football better than Tim.
=> Tim doesn't play footbal better than Mark.
3.Beckham was a very good football player
=> Beckham played football very well.
4.How long have you played basketball ?
=> When did you play basketball ?
5.Shall we play badminton this weekend ?
=> How about palying badminton this weekend ?
6.No sport in Britain is as popular as football.
=> Football is the most popular sport in Britain.
7.My brother is not so intersting in basketball as I am.
=> I am more intersting in basketball than my brother.
8.It's good for you to do morning exercise regularly.
=> You should do morning exercise regularly.
Nếu sai thì thông cảm cho mk nha
!.....HT.....!
17 tháng 9 2018
1 + 2 + 3 + 4 + 5 +6 + 7 = 8+ 9 + 10 + 5 = 28 = 32 = 28 < 32
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 x 0 = 0
10 x 100 x 1000 x 10000 x 0 = 0
1 x 1 x 1 x 1 x 1 x 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 = 362880
10 : 2 : 3 : 4 : 5 : 6 : 7 : 8 : 9 = ???
C
8
VỐ SỐ SỐ NHÉ
shitbo nói thế hơi chung quá bạn,mặc dù đúng =))
Để \(\left(a^2-1\right)\left(a^2-4\right)\left(a^2-7\right)\left(a^2-10\right)>0\)
Có hai trường hợp:
TH1:
(do a nguyên)
TH2:
(bạn tự làm tiếp nhé)
Vậy ...