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= 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:))
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
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.
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.
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
x=-1 rồi giải gì nữa ??