Question

Tính hợp lí

(8-65+10)-(10+78-55)

Answer 1

Đầu tiên là bỏ dấu ngoặc:

8-65+10-10-78+55

=(8-78)+(55-65)+(10-10)

=(-70)+(-10)+0

=-80

Answer 2

\(\left(8-65+10\right)-\left(10+78-55\right)\)

\(=8-65+10-10-78+55\)

\(=\left(8-78\right)-\left(65-55\right)+\left(10-10\right)\)

\(=-70-10+0\)

\(=-80\)