Question

1道算术题-4.25乘以4又6分之5减去4.25乘以6又6分之1加4又4分之1.简便算法

Answer 1

原式=-4.25×29/6-4.25×37/6+17/4

=-4.25×(29/6+37/6)+4.25

=-4.25×11+4.25

=-4.25×(11-1)

=-4.25×10

=-42.5