x/2=y/5 25%x+40%y=1.4
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x/2=y/5 25%x+40%y=1.4
![x/2=y/5 25%x+40%y=1.4](/uploads/image/z/15588341-53-1.jpg?t=x%2F2%3Dy%2F5+25%25x%2B40%25y%3D1.4)
由x/2=y/5 推出x=2y/5.1式
由25%x+40%y=1.4 推出5x+8y=28 2式
将1式代入2式,得,y=2.8 则x=1.12
答:x=1.12,y=2.8
由25%x+40%y=1.4 推出5x+8y=28 2式
将1式代入2式,得,y=2.8 则x=1.12
答:x=1.12,y=2.8
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
(x+y)(x+2y)(x+3y)(x+4y)=-40
2x+3y=40x-y=-5
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
x-y / 5y= (y-x)^2 / ( )
{x/2=y/5 {25%x+40%y=1.4
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
5(x-y)^3*[-6/25(y-x)^3][-2/3(y-x^4]=
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013