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0.125×16 3.2×5.6.4 5.74×99+5.74 4.75+3....

(1)0.125×16=0.125×8×2,=1×2,=2;(2)3.2×5.6-11.4=17.92-11.4,=6.52;(3)5.74×99+5.74=(99+1)×5.74,=100×5.74,=574;(4)4.75+3.25×2.4+7.6=4.75+7.8+7.6,=20.15;(5)3.8×1.4+18.2÷0.7=5.32+26,=31.32;(6)4.8×0.25=4×0.25...

5.74×99+5.74 =5.74×(99+1) =5.74×100 =574

原式=5.74×(99+1)=5.74×100=574

74.5+99×74.5 =74.5×(99+1) =74.5×100 =7450

(1)2220÷37=60;(2)47×67=3149;(3)74×76=5624;(4)123123÷1001=123;(5)3456×9999=3456×(10000-1),=3456×10000-3456,=34560000-3456,=34556544;(6)489+507+505+492+497+509+500=(500-11)+(500+7)+(500+5)+(500-8)+(...

5.74×99+5.74 =5.74*(99+1) =5.74*100 =574

5.74×99+5.74 =5.74×(99+1) 用了(乘法分配律) =5.74×100 =574

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