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5.7%1.9x0.2➗7.6=用简便方法

12.6x7.6x2.32➗1.9➗1.4➗2.9如何用简便计算? 12.6x7.6x2.32➗1.9➗1.4➗2.9 =(12.6÷4)*(7.6÷1.9)*(2.32÷2.9) =3.15*4*0.8 =10.08

0.8x0.25x0.4x12.5 4.58➗2.5➗0.4 都简便计算过程具体 0.8x0.25x0.4x12.5 =(0.8*12.5)*(0.25*0.4) =10*0.1 =1 4.58➗2.5➗0.4 =4.58÷(2.5*0.4) =4.58÷1 =4.58

5➗(7➗11)➗(11➗16)➗(16➗35)简便方法 5➗(7➗11)➗(11➗16)➗(16➗35) =(11÷11)*(16÷16)*(35*5÷7) =1*1*25 =25

结合律。 列式为: 2100➗42 =2100➗(7x6) =2100➗7➗6 =300➗6 =50

()+()=8++()+()=6||||138设:x+y=8,z+w=6,x+z=13,y+w=8则:x+y=8(1)x+z=13(2)z+w=6(3)y+w=8(4)(4)-(3):y-z=2(5)(1)-(2):y-z=-5(6)(5)(6)矛盾因此原方程组无解

3.6÷(0.25x(17.3+30.7)] =3.6➗[0.25x48] =(3.6➗12)➗(0.25x4) =0.3➗1 =0.3

2.1*5.1 *159.1➗0.7➗1.7➗3.7 =(2.1➗0.7)*(5.1 ➗1.7)*(159.1➗3.7) =3x3x43 =387

450除以五再除以九怎么用简便方法算 450➗5➗9 =450➗(5x9) =450➗45 =10

解:9000000➗25➗125➗8➗5➗4➗2 =9000000➗(25x125x8x5x4x2) =9000000➗(25x4x5x2x125x8) =9000000➗(100x10x1000) =9

926➗125用简便方法算 926➗125 =(1000-74)➗125 =1000➗125-74➗125 =8-0.592 =7.408

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