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 0.25×0.8×4×0.125.
根据题意可得: (1)2.65×1.7+1.35×1.7, =(2.65+1.35)×1.7, =4×1.7, =6.8; (2)23.4÷7.8-2.1, =3-2.1, =0.9; (3)0.25×0.8×4×0.125, =(0.25×4)×(0.8×0.125), =1×0.1, =0.1. |
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