Question

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

Answer 1

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