问题 计算题
用简便方法计算。
(1)4.5×7.1+2.9×4.5(2)0.4×23.6×0.25
(3)9.9×3.6(4)0.386÷0.25÷0.4
答案

(1)原式= 4.5×(7.1+2.9)

                = 45(2)原式=0.4×0.25×23.6

                =2.36

(3)原式=(10-0.1)×3.6

                =36-0.36

                =35.64(4)原式=0.386÷(0.25×0.4)

               =0.386÷0.1

               =3.86

单项选择题
单项选择题