2x-7(7x-2y)-2(x+6y)
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Wmfۀ9H:R4I= e6q
3(x-y)^2-7(x-y)+8(y-x)^2+6(y-x)合并同类项.
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方
计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
化简3(x-y)-7(x--y)+2(y-x)
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
-6x-y-7x+6x-2y-10x+8y+x+6x-8y的值
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
-8(2x-y)-{7x-[6x+2y-(10x-8y)]}等于多少?
3x+5y-(x+y)=6 2(x+y)-3x=-7
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
将(x-y)看成一个整体,将3(x-y)²-4(x-y)+7(x-y)-6(y-x)²-2(y-x)合并同类项.
x+2y=2x+y+1=7x-y 求:2x-y?
(-3x+7y)(-7y-3x)-(x-3y)(2x+3y)
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7