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用简便算法计算下面各题102×0.35 (8+0.8)×1.25 7...

(1)102×0.35,=100×0.35+2×0.35,=35+0.7,=35.7;(2)(8+0.8)×1.25,=8×1.25+0.8×1.25,=100+10,=110;(3)7.7×1.7+2.3×7.7,=7.7×(1.7+2.3),=7.7×4,=30.8;(4)2.98×0.25×40,=2.98×(0.25×40),=2.98×10,=29.8;(5)0.28×99,...

1.25×8+0.8×7 =1.25*8+8*0.1*7 =8*(1.25+0.7) =8*1.25+8*0.7 =10+5.6 =15.6

=8×1.25+0.8×1.25

1.25×8+1.25×0.8=10

(1)0.8×33×1.25,=0.8×1.25×33,=1×33,=33;(2)1718×910+1718÷10,=1718×(910+110),=1718×1,=1718;(3)3?59×720?1136,=3-(736+1136),=3-12,=2.5;(4)7.2×9.9,=7.2×10-7.2×0.1,=72-0.72,=71.28.

1.25×0.7×0.8 =1.25x0.8x0.7 =1x0.7 =0.7

(1)0.8×3.9×1.25=0.8×1.25×3.9=1×3.9=3.9;(2)3.6×10.1=3.6×(10+0.1)=3.6×10+3.6×0.1=36+0.36=36.36;(3)4.8×1.25=6×0.8×1.25=6×(0.8×1.25)=6×1=6;(4)4.87×2.34+48.7×0.266=4.87×2.34+4.87×2.66=4.87×(2.34+2.66)=4.87×5=24.35.

原式 =(0.8x1.25)x0.94 =1x0.94 =0.94 供参考。

(1)10.15-10.75×0.4-5.7,=10.15-4.3-5.7,=10.15-(4.3+5.7),=10.15-10,=0.15;(2)5.8×(3.87-0.13)+4.2×3.74,=5.8×3.74+4.2×3.74,=(5.8+4.2)×3.74,=10×3.74,=37.4;(3)32.52-(6+9.728)÷3.2×2.5,=32.52-15.728÷3.2×2.5,=3...

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