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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,...

0.8×1.25×7.8

(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.

1.25×8+1.25×0.8=10

=1.25*8+1.25*0.8 =10+1 =11

1.6×7.5×1.25 =(2×7.5)×(0.8×1.25) =15×1 =15 56×1125 =7×(8×1.25) =7×10 =70 3.4×7×1.5 =(1.7×7)×(2×1.5) =11.9×3 =35.7 0.8×0.25×0.4×12.5 =(0.8×12.5)×(0.25×0.4) =10×0.1 =1

(1)1.25×35×0.8,=(1.25×0.8)×35,=1×35,=35;(2)6.78×99+6.78,=6.78×(99+1),=6.78×100,=678;(3)4.75+3.25×2.4+7.6,=3.25+1.5+3.25×2.4+7.6,=3.25×(1+2.4)+(7.6+1.5),=11.05+9.1,=20.15;(4)2.85÷0.25÷0.4,=2.85÷(0...

(1)2.5×(3.8×0.04)=2.5×0.04×3.8=0.1×3.8=0.38;(2)7.69×101=7.69×(100+1)=7.69×100+7.69×1=769+7.69=776.69;(3)(8×5.27)×1.25=8×1.25×5.27=10×5.27=52.7;(4)0.125×72 =0.125×8×9=1×9=9;(5)1.2×0.25+2.8×0.25 =(1.2+2.8)×0...

(1)9.8×25=(10-0.2)×25=10×25-0.2×25=250-5=245;(2)0.3×2.5×0.4=0.3×(2.5×0.4)=0.3×1=0.3;(3)2.33×0.5×0.4×5=2.33×(5×0.4×0.5)=2.33×1=2.33;(4)0.8×630×0.125=(0.8×0.125)×630=0.1×630=63;(5)0.13×102=0.13×100+0.13×2=13...

①3871-(1080-740)×7,=3871-340×7,=3871-2380,=1491;②5175÷207+102×9,=25+918,=943; ③0.9+1.08+0.92+0.1,=(0.9+0.1)+(1.08+0.92),=1+2,=3;④13.59-6.91-0.09,=13.59-(6.91+0.09)=13.59-7,=6.59; ⑤983×(3.8+2.2)+0.237×10...

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