(-4)×(-5)×0.25===100×(-3)×(-5)×0.01===2.25×(-2.3)×3/25===(-2.1)×6.5×(-3/7)===

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(-4)×(-5)×0.25===100×(-3)×(-5)×0.01===2.25×(-2.3)×3/25===(-2.1)×6.5×(-3/7)===(-4)×(-5)×0.25===100×(-

(-4)×(-5)×0.25===100×(-3)×(-5)×0.01===2.25×(-2.3)×3/25===(-2.1)×6.5×(-3/7)===
(-4)×(-5)×0.25
=
=
=
100×(-3)×(-5)×0.01
=
=
=
2.25×(-2.3)×3/25
=
=
=
(-2.1)×6.5×(-3/7)
=
=
=

(-4)×(-5)×0.25===100×(-3)×(-5)×0.01===2.25×(-2.3)×3/25===(-2.1)×6.5×(-3/7)===
(-4)×(-5)×0.25=20×0.25=5
100×(-3)×(-5)×0.01=-300×-5×0.01=1500×0.01=15
其余的你可以根据上面这个做法做一下.慢慢做,主要是会步骤,结果错不重要,重要是会做.可以翻下书,你会做得比姐姐厉害的,呵呵!

(-4)×(-5)×0.25
=20 * 0.25
=5
连乘或者除的首先确定正负,然后一个一个计算
小朋友,我相信这些你都能自己完成,加油!