Tính a) (−9).(+3).(−2).(−11). b) (−5)^2.(−2)^5 c) (−13).(+7) − 4.(−15)

* Hướng dẫn giải

1. (−9).(+3).(−2).(−11) = −594.

2. ${(-5)}^2 . {(-2)}^5$ = 25.(−32) = −800.

3. (−13).(+7) − 4.(−15) = −91 + 60 = −31.