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5.7%1.9x0.2➗7.6怎么简便运算

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

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

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

()+()=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

列式为: 0.2x0.2x0.2➗(0.04x0.04) =0.04x0.2➗0.04➗0.04 =(0.04➗0.04)x(0.2➗0.04) =1x5 =5

x➗5/6x0.875=3 解:x➗5/6x7/8x5/6➗7/8=3x5/6➗7/8 x=20/7

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