用简便方法计算下面各题. ①4.8×0.25 ②2.33×0.5×4 ③1.

2025-06-26 23:24:26
推荐回答(1个)
回答1:

①4.8×0.25
=1.2×(4×0.25)
=1.2×1
=1.2

②2.33×0.5×4
=2.33×(0.5×4)
=2.33×2
=4.66

③1.5×105
=1.5×(100+5)
=1.5×100+1.5×5
=150+7.5
=157.5

④1.2×2.5+0.8×2.5
=(1.2+0.8)×2.5
=2×2.5
=5.