Question

【题目】用简便方法计算下面各题

4.7×10.2

0.88×4.9+5.1×0.88

2.5×8×0.4×0.125

4.85×9.9+0.485

Answer 1

【答案】4.7×10.2

=4.7×(10+0.2)

=4.7×10+4.7×0.2

=47+0.94

=47.94　

　0.88×4.9+5.1×0.88

=0.88×(4.9+5.1)

=0.88×10

=8.8　

　2.5×8×0.4×0.125

=(2.5×0.4)×(8×0.125)

=1×1

=1　

　4.85×9.9+0.485

=4.85×9.9+4.85×0.1

=4.85×(9.9+0.1)

=4.85×10

=48.5

【解析】

略