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脱式计算,能简算的要简算.0.8×0.25×4×0.5;4.6×[...

(1)0.8×0.25×4×0.5=(0.8×0.5)×(4×0.25)=0.4×1=0.4;(2)4.6×[3÷(1.45-1.05)]=4.6×[3÷0.4]=4.6×7.5=34.5;(3)55×9.9=55×(10-0.1)=55×10-55×0.1=550-5.5=544.5;(4)4.87×2.34+4.87×7.66=4.87×(2.34+7.66)=4.87×10=48.7.

(1)0.125×0.25×8×4=(0.25×4)×(0.125×8)=1×1=1;(2)54×(56-29 )=54×56-54×29=45-12=33;(3)35×13+35÷113=35×13+35×13=35×(13+13)=35×26=785;(4)8.05-0.75-14=8.05-0.75-0.25=8.05-(0.75+0.25)=8.05-1=7.05.

先算12.5*8=100*4.36=436 15.2/0.25/4=15.2*(0.25*4)=12.5

(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.

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....

①4.5×102, =4.5×(100+2), =4.5×100+4.5×2, =450+9, =459; ②0.85×6.7+3.3×0.85, =(6.7+3.3)×0.85, =10×0.85, =8.5; ③0.25×4.87×4, =(0.25×4)×4.87, =1×4.87, =4.87; ④25.8-1.58×0.65, =25.8-1.027, =24.773. 原理及解决简...

(1)2.5×1.37×0.4,=2.5×0.4×1.37,=1×1.37,=1.37;(2)4.8×0.25,=1.2×4×0.25,=1.2×(4×0.25),=1.2×1,=1.2;(3)0.89×4.8+0.89×5.2,=0.89×(4.8+5.2),=0.89×10,=8.9;(4)101×0.78,=(100+1)×0.78,=100×0.78+1×0.78,=78+0.78...

(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.

(1)0.125×0.25×8×4,=(0.125×8)×(0.25×4),=1×1,=1;(2)6.6×12+8×6.6,=6.6×(12+8),=6.6×20,=132;(3)[5-1.7÷(2-1)]×1,=[5-1.7÷1]×1,=[5-1.7]×1,=3.3×1,=3.3;(4)20×2.5÷(10×0.7+3),=20×2.5÷(7+3),=20×2.5÷10,=50...

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