急急急~ 计算:(1)[-2的2次方+(-2)的3次方]-(-2)×(-3)

(2)[19+(-8×2+3的2次方)]÷(-12)(3)-3-[-5-0.2÷4/5×(-2)的2次方]
2024-12-14 21:42:59
推荐回答(1个)
回答1:

(1)[-2的2次方+(-2)的3次方]-(-2)×(-3)
=[-4-8]-6
=-12-6
=-18
(2)[19+(-8×2+3的2次方)]÷(-12)
=[19+(-16+9)]÷(-12)
=[19-7]÷(-12)
=12÷(-12)
=-1
(3)-3-[-5-0.2÷4/5×(-2)的2次方]
=-3-[-5-1/4×4]
=-2-[-5-1]
=-2+6
=4