一题0.23×0.4×0.5二题3.8×305+6.2×3.5三题103×0.23四题1.2×98五题2.4×1.25

来源：百度知道 编辑：UC知道 时间：2024/05/15 00:36:59
大家帮帮忙,计算一下. 要用简便计算哈```今天一定要写好``各位.谢谢噢!``
谁能帮莪计算一下这些数学问题:一题0.23×0.4×0.5二题3.8×305+6.2×3.5三题103×0.23四题1.2×98五题2.4×1.25

0.23×0.4×0.5 103×0.23 1.2×98
=0.23×(0.4×0.5) =(100+3)×0.23 =(1+0.2)×98
=0.23×0.2 =100×0.23+3×0.23 =1×98+0.2×98
=0.046 =23+0.69 =98+19.6
=23.69 =117.6

2.4×1.25
=0.3×8×1.25 那个3.8×305+6.2×3.5不能简便计算啊，是
=0.3×(8×1.25) 不你抄错啦？
=0.3×100
=30