6x—2y=21 2y╳15=18+2y+6x 这是一个方程组,
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6x—2y=21 2y╳15=18+2y+6x 这是一个方程组,
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
已知x和y满足x+3y+|3x-y|=19,2x+y=6,求x,y的值
设x,y满足x+3y+|3x-y|=19,2x+y=6则X= Y=
解方程组 2y-(x+1)=18 6(2x-y)=18x+y
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
9(x+y)-2(x+y)-6(x+y)+18(x+y)合并同类项
合并同类项:9(x+y)-2(x+y)-6(x+y)+18(x+y)
4.因式分解x2(x-y)+y2(y-x)=(x+y)(x-y)^2
方程组2分之x+y+3分之x-y=6,2(x+y)-3x+3y=24
已知x+y=8,x-y=6,求x²-y²-2x-2y的值.
若x+2y=62x+y=9.则x+y=?
已知x/y=2/3,求3x-y/x+2y的值
若|x-y-5|与|2x+3y-15|互为相反数,则x+y=?
化简y(x+y)+(x+y)(x-y)-x^2
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
计算:(x-y)^2*(y-x)^2*(x-y)^6