计算下面各题,能简算的要简算.1.29+3.7+2.71+6.3 3.75÷[0.3×(1.34-0.84)] 7.2×7.2+7.2×2.8 0.25
计算下面各题,能简算的要简算.1.29+3.7+2.71+6.33.75÷[0.3×(1.34-0.84)]7.2×7.2+7.2×2.80.25×0.8×0.125×4...
计算下面各题,能简算的要简算.1.29+3.7+2.71+6.3 3.75÷[0.3×(1.34-0.84)] 7.2×7.2+7.2×2.8 0.25×0.8×0.125×4 25×10.8×0.04 15.32-1.8×5-3.46.
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(1)1.29+3.7+2.71+6.3, =(1.29+2.71)+(3.7+6.3), =4+10, =14; (2)3.75÷[0.3×(1.34-0.84)], =3.75÷[0.3×0.5], =3.75÷0.15, =25; (3)7.2×7.2+7.2×2.8, =7.2×(7.2+2.8), =7.2×10, =72; (4)0.25×0.8×0.125×4, =(0.25×4)×(0.125×0.8), =1×0.1, =0.1; (5)25×10.8×0.04, =25×0.04×10.8, =1×10.8, =10.8; (6)15.32-1.8×5-3.46, =15.32-9-3.46, =6.32-3.46, =2.86. |
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