3x-3=y+5 5y-5=3x+15的解答
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(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
5x=3y,(2x+y)的平方=5x(x+y)+9
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1 y=13分之1
若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
若x-y分之x+y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5