Question

2.48×0.5+1.23×0.4能不能用简便计算？

Answer 1

你好，同学，简便算法如下：
2.48×0.5+1.23×0.4
=（2.5-0.02）×0.5+（1.2+0.03）×0.4
=2.5×0.5-0.02×0.5+1.2×0.4+0.03×0.4
=1.25-0.01+0.48+0.012
=1.25+0.48-0.01+0.012
=1.73+0.002
=1.732

Answer 2

2.48×0.5+1.23×0.4
=1.24+1.23×0.4
=1.24+1.24×0.4-0.004
=1.24*1.4-0.004
=0.124*14-0.004
=0.12*14+0.004*14-0.004
=0.84*2+0.004*13
=1.68+0.052
=1.732

Answer 3

不能，还是直接算最简便。
2.48×0.5+1.23×0.4
=1.24+0.492
=1.732。

Answer 4

简便计算如下，原式＝（1.24*2）*0.5+1.23*0.4＝1.24+（1+0.23)*0.4＝1.24+0.4+0.23*0.4＝1.64+0.092＝1.732

Answer 5

2.48×0.5＋1.23×0.4
=2.48×0.4+1.23×0.4+2.48×0.1
=3.71×0.4+0.248
=1.484+0.248
=1.732