用简便方法计算下面各题.(1)8.35×101-8.35 (2)(3.4×0.8+9.2×3.4)÷34÷0.05.
(1)8.35×101-8.35, =8.35×(101-1), =8.35×100, =835; (2)(3.4×0.8+9.2×3.4)÷34÷0.05, =[3.4×(0.8+9.2)]÷34÷0.05, =[3.4×10]÷34÷0.05, =34÷34÷0.05, =1÷0.05, =20. |
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用简便方法计算下面各题.(1)8.35×101-8.35 (2)(3.4×0.8+9.2×3.4)÷34÷0.05.
(1)8.35×101-8.35, =8.35×(101-1), =8.35×100, =835; (2)(3.4×0.8+9.2×3.4)÷34÷0.05, =[3.4×(0.8+9.2)]÷34÷0.05, =[3.4×10]÷34÷0.05, =34÷34÷0.05, =1÷0.05, =20. |
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