Question

 thực hiện phép tính (tính nhanh nếu có thể)

t cần gấp

 

Answer 1

7: \(\left(-2\right)+4-3=\left(-2-3\right)+4=-5+4=-1\)

8: \(\left(-6\right)+5+5=\left(-6\right)+\left(5+5\right)=10-6=4\)

9: \(\left(-2\right)+7+1=\left(-2\right)+\left(7+1\right)=8-2=6\)

10: \(\left(-4\right)+14-10\)

\(=\left(-4-10\right)+14\)

=14-14

=0

11: \(\left(-7\right)+5+2\)

\(=\left(-7\right)+\left(5+2\right)\)

=7-7

=0

12: \(\left(-6\right)+4+2\)

\(=\left(-6\right)+\left(4+2\right)\)

=-6+6

=0