Question

1.25+1.25×7.4+1.25÷0.625等于多少巧算？

Answer 1

1.25+1.25×7.4+1.25÷0.625

=1.25+1.25×7.4+1.25÷5/8

=1.25×1+1.25×7.4+1.25×1.6   ......改写

=1.25×（1+7.4+1.6）   .......乘法的分配律

=1.25×10

=12.5

Answer 2

0.625=5/8
1.25/0.625=1.25*8/5=1.25*1.6
1.25（1+7.4+1.6）
=1.25*10
=12.5