Question

tìm x,bt

1-3+5-7+9-11+...+x=-100

Answer 1

Mk ko viết lại đề bài nhé

<=> -2-2-2-...-2=-100

<=>(-2)(\({\\{x-1} \over 4}\)+1)=-100

<=>\({\\{x-1} \over 4}\)+1=50

<=>\({\\{x-1} \over 4}\)=49

<=>x-1=196

<=>x=197

Nhớ k nha

Answer 2

x = 197