5x-y=120 3y-11x=120 谁会求?
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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-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)
X[X/(Y+X)+X/(X-Y)]=120/288 求X/Y
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
{x+y=5{3x-7y=11
3*X=Y X/2=Y/5+11
6(x+y)的平方-11(x+y)(x-y)+3(x-y)的平方=?
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
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
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
5x-y=120 3y-11x=120 谁会求?
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5