计算下面各题。(1)85-39-28 (2)82-35+29(3)84-(27+38) (4)35+(64-39)(5)81-(29+17) (6)45+(27-14)(7)82-(29+36) (8)48+(46-27)
计算下面各题,能简算的要简算- (+ )+ + - (- )+ -+
直接写得数- =-=+ = 1 - =+=- =
用简便方法计算下面各题。 43.6+9.8+6.417.3× 0.25× 8 2.31×1.5+1.5×7.690.65×201
口算: 0.4×0.02= 3.5+7.6= 1.23÷3= 2.4×2.5= 16÷1.6= 0.9÷0.01=7÷0.25= 99×0.25= 12×0.4+0.4×13= 4×(1.5+0.25) =
脱式计算,能简算的要简算。 2.65×1.7+1.35×1.7 23.4÷7.8-2.1 0.75×18÷0.152.5×3.2×1.25