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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)3m×1四-7×3m-3m,=3m×(1四-7-1),=3m×10,=1;(2)99×979四,=(9四+1)×979四,=9四×979四+1×979四,=97+979四,=97979四;(3)0m×7.7+3.3×0.四-四0%,=0.四×7.7+3.3×0.四-0.四,=0.四×(7.7+3.3-1),=0.四×10,=四;(0)12+11+112+...

1.25×8+1.25×0.8=10

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

3.7×1.4×0.05=3.7×(1.4×0.05)=3.7×0.07=0.259 72×0.81+10.4=58.32+10.4=68.72 1.4×25+3.45=(1+0.4)×25+3.45=25+0.4×25+3.45=25+10+3.45=35+3.45=38.45 1.5×102=1.5×(100+2)=1.5×100+1.5×2=150+3=153 1.25×0.7×0.8=1.25×0.8×0.7=1×0.7=0.7...

(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)102×0.55 =(100+2)×0.55 =100×0.55+2×0.55 =55+1.1=56.1;(2)10.7-22.78÷3.4 =10.7-6.7=4;(3)10.8×0.8÷2.7=(10.8÷2.7)×0.8=4×0.8=3.2.

(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.

①48-2.3×12,=48-27.6,=20.4;②50×(0.8+0.4),=50×0.8+50×0.4,=40+20,=60;③7.34×2.1+7.34×7.8+7.34×1.1,=7.34×(2.1+7.8+1.1),=7.34×10,=73.4;④20.5÷1.25÷0.8,=20.5÷(1.25×0.8),=20.5÷1,=20.5;⑤(8.1-5.4)÷3.6+85.7,=2.7÷3.6...

①7.6×0.8+0.42,=6.08+0.42,=6.5;②3.2×1.25×0.25,=4×0.8×1.25×0.25,=(4×0.25)×(0.8×1.25),=1×1,=1;③7.8×1.01,=7.8×(1+0.01),=7.8+0.078,=7.878;④1.36+0.7×5.4,=1.36+3.78,=5.14;⑤ 8 9 -( 1 4 - 1 9 )- 3 4 ,= 8 9 - 1 4...

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