小学：四下计算练习1

1.口算。0. 07X 10 =5X8 —8. 74-10 =5X5 =2.64X10=.用竖式计算。 11.23-8. 29 =0.6X0. 5 =. 75-0.2 =0.9X100 =12.5X0