7x-6y=3 3x+6y=9 x= y=
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若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
7x-6y=3 3x+6y=9 x= y=
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
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
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
6(x+y)的平方-11(x+y)(x-y)+3(x-y)的平方=?
3x+5y-(x+y)=6 2(x+y)-3x=-7
(x-y)的4次方/(y-x)的3次方+(x-y)0的次方*(y-x)+(-x-y)7次方/(x+y)6次方=
x+y/2+ x-y/2=6 2(x+y)-3x+3y=24 求X Y
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 联立方程 有的话