x-3y=-20 3x+7y=100
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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
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
(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
推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.
计算3x/(x-3y)+(x+y)/(4y-x)-7y/(x-4y)=?
若x,y为正整数,且满足3x(x+y)-y(x+y)=7,求x,y
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
7y(x-3y)-2(3y-x)=0 .x=?,y=?
化简 x-y/(y-x)^3=
(x+y)(2x-3y)=?
5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值;
(1){x-3y+20=0,{3x+7y-100=0;(2) {2y-8=-x,{4x+3y=7;