2x+y=90 y:x=4:7
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2x+y=90 y:x=4:7
2x+y=90 y:x=4:7
2x+y=90 y:x=4:7
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
2x+y=90 y:x=4:7
(x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
7x:4y,x:y=( ):(
(x-4y)(2x+y)=
3x+x+4y+(90+10)x=3y-(2x+y)+510y=34x
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把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=
x+2y=2x+y+1=7x-y 求:2x-y?
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y'=(y/x)^2+y/x+4微分方程
x*x+2x+y*y-4y+5=0 x= y=