1--
口算。+= -= += - +=0.63×1000= 0. 75-0.25= 0.07+0.03= 0. 9÷0.03= 0.4×0.8=
脱式计算下面各题。4÷-0.6 ×÷(+)÷ ÷[1÷(-)]
÷+×
20×(+)
(1)1-0.47= (2)6.4-4=(3)0.25×12= (4)(5) (6)(7)0.88÷2.2= (8)0.08×0.5=(9) (10)72.1×1000=
10-÷×1
[一(一)]÷
÷=
-=
27×=
10-=
计算: