Question

4.75*17.5+2.5*475的简便运算方法

Answer 1

4.75*17.5+2.5*475

=(5-0.25)(20-2.5)+2.5*(500-25)

=100-5*2.5-5+0.25*2.5+ 2.5*500-2.5*25

=100-12.5-5+0.625+1250-62.5

=100.625+1250-5-75

=1270.625