Question

12.5*1.86+42/5分之7+25.4*4分之5简便运算

Answer 1

12.5*1.86+42/5分之7+25.4*4分之5

=1.25*18.6+42*7分之5+25.4*1.25

=1.25*（18.6+25.4）+30

=1.25*44+30

=55+30

=85