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计算下面各题,能简算的要用简便方法计算.(1)0....

(1)0.75×99+0.75=0.75×(99+1),=75;(2)56-(23-16)=56+16-23,=13;(3)(8.5-4)×(0.32÷1.6)=4.5×0.2,=0.9;(4)56×[1÷(78?34)]=56×[1÷18],=56×8,=203;(5)0.925×17+9.25×8.3=9.25×1.7+9.25×8.3,=9.25×(1.7+8.3),=9.25×10...

(1)50-0.45-9.55=50-(0.45+9.55)=50-10=40;(2)1.25×0.25×0.8×4=(1.25×0.8)×(0.25×4)=1×1=1;(3)417×35+1317÷53=417×35+1317×35=(417+1317)×35=1×35=35;(4)1650-480÷16×15=1650-30×15=1650-450=1200;(5)(8.42-7.5)÷0.23×2...

(1)原式=17.92-7.92-0.3 =10-0.3 =9.7 (2)原式=210÷(14×5) =210÷70 =3 (3)原式= × + × =( + )× = (4)原式= ÷( × ) = ×5 =

①2.9+0.46+7.1+0.54=(2.9+7.1)+(0.46+0.54)=10+1=11;②(31.6-11.7)÷2.5÷0.4=19.9÷(2.5×0.4)=19.9÷1=19.9;③0.4×37×25=37×(0.4×25)=37×10=370;④4.97÷1.25+3.03×8=4.97÷108+3.03×8=0.497×8+3.03×8=(0.497+3.03)×8=3.527×8=28.216.

(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.

(1)0.75+1.25×2.4=0.75+(1.25×8)×0.3=0.75+10×0.3=0.75+3=3.75;(2)5.67×0.21-0.62=1.1907-0.62=0.5707;(3)3.8×6.7+3.3×3.8=3.8×(6.7+3.3)=3.8×10=38;(4)1.28×0.29-0.29×0.28=0.29×(1.28-0.28)=0.29×1=0.29;(5)101×4.8=(100...

(1)0.25×8.75×4,=0.25×4×8.75,=100×8.75,=875;(2)25.8×7+3×25.8,=25.8×(7+3),=25.8×10,=258;(3)10÷0.2÷2.5,=10÷(0.2×2.5),=10÷0.5,=20;(4)21.36÷0.8-12.9,=26.7-12.9,=13.8.

(1)1.2-0.5×1.8÷0.9 =1.2-0.9÷0.9 =1.2-1=0.2; (2)(25+16-215)×60 =25×60+16×60-215×60 =24+10-8=26; (3)4397×98=4397×(97+1)=4397×97+4397=43+4397=434397;(4)1.8×14+3.2×25% =(1.8+3.2)×0.25=5×0.25 =1.25;(5)8×9×1.25=8×...

(1)12.25-3.1+0.85-6.17,=(12.25+0.85)-3.1-6.17,=13.1-3.1-6.17,=3.83;(2)2.65×1.7+1.35×1.7,=(2.65+1.35)×1.7,=4×1.7,=6.8;(3)3.6÷(1.2+0.5)×5,=3.6÷1.7×5,=3617×5,=101017; (4)0.125×0.38×80,=(0.125×80)×0.38...

(1)4.2×(6.18-3.03)+6.3,=4.2×3.15+6.3,=13.23+6.3,=19.53;(2)15.02-6.8-(1.02+1.2),=15.02-6.8-1.02-1.2,=(15.02-1.02)-(6.8+1.2),=14-8,=6;(3)0.6×[(5-0.68)÷1.2],=0.6×[4.32÷1.2],=0.6×3.6,=2.16;(4)2.7÷4+6...

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