Question

简便运算：9.8*62.5*1.25-12.5*0.625*18

Answer 1

9.8*62.5*1.25-12.5*0.625*18

=9.8*62.5*1.25-1.25*62.5*1.8

=62.5*1.25*（9.8-1.8）

=62.5*1.25*8

=62.5*10

=625