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脱式计算,能简算的要简算.0.8×0.25×4×0.5;4.6×[...

(8.1÷0.4+0.5)×0.6 =(8÷0.4+0.1÷0.4+0.5)×0.6 =(20+0.25+0.5)×0.6 =20×0.6+0.25×0.6+0.5×0.6 =12+0.15+0.3 =12.45

3.6x0.5-4.2÷4 =1.8-1.05 =0.75

64x0.25x0.5x1.25 =4x2x8x0.25x0.5x1.25 =(4x0.25)x(2x0.5)x(8x1.25) =1x1x10 =10

①0.125×0.25×8×4,=(0.125×8)×(0.25×4),=1×1,=1;②6.6×12+8×6.6,=(12+8)×6.6,=20×6.6,=132;③ 11 9 × 3 5 + 11 9 ÷ 2 5 = 11 9 × 3 5 + 11 9 × 5 2 ,=( 3 5 + 5 2 )× 11 9 ,=( 6 10 + 25 10 )× 11 9 ,= 31 10 × 11 9 ,= 341...

(1)6.72-2.3÷0.5×0.8=6.72-4.6×0.8=6.72-3.68=3.04;(2)98-17+18-67=(98+18)-(17+67)=54-1=14;(3)910÷[12×(65-310)]=910÷[12×910]=910÷920=2;(4)(27+15)×7×5=27×7×5+15×7×5=10+7=17.

①1.258×18.5-0.258×18.5,=18.5×(1.258-0.258),=18.5×1,=18.5;②8.48÷0.8×0.9,=10.6×0.9,=9.54;③1.25×2.4,=1.25×8×0.3,=10×0.3,=3;④5.85÷(1.3+0.5)×6,=5.85÷1.8×6,=3.25×6,=19.5.

(1)17.64÷4.9+6.73=3.6+6.73,=10.33;(2)3.4÷[(1.2+0.5)×5]=3.4÷[1.7×5],=3.4÷1.7÷5,=2÷5,=0.4;(3)1.9+19.9+199.9+0.3=1.9+19.9+199.9+0.1+0.1+0.1,=(1.9+0.1)+(19.9+0.1)+(199.9+0.1),=2+20+200,=222;(4)0.25×12.5×3....

(1)2.72÷[(8.2-6.5)×0.5]=2.72÷[1.7×0.5],=2.72÷0.85,=3.2;(2)9.12+9.12×9-60.2=(1+9)×9.12-60.2,=10×9.12-60.2,=91.2-60.2,=31;(3)28.4÷0.4÷0.25=28.4÷(0.4×0.25),=28.4÷0.1,=284;(4)27.36-27.36÷7.6=27.6-3.6,=24.

①12.5×0.4×2.5×8=(12.5×8)×(0.4×2.5)=100×1=100②9.5×101=9.5×(100+1)=9.5×100+9.5=959.5③43.2-1.8×3-4.6=43.2-5.4-4.6=43.2-(5.4+4.6)=33.2④4.2×7.8+2.2×4.2=4.2×(7.8+2.2)=4.2×10=42⑤0.87×3.16+4.64=2.7492+4.64=7.3892⑥12.5×4.8=12....

(1)0.034×0.5×0.6=0.017×0.6=0.0102;(2)3.6÷1.2-0.5×5=3-2.5=0.5;(3)(6.1-4.6)×0.8-1=1.5×0.8-1=1.2-1=0.2;(4)5.4×3.08+3.08×3.6=(5.4+3.6)×3.08=9×3.08=27.72.

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