(1){x+y=3,3x-y=-1(2){7x+3y-36=0,2x+9y-51=0(3){7x+y=36,2y+3x=42
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y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
已知2x-y=0,求分式【1+(3*y*y*y/x*x*x-y*y*y)】/【1+(2y/x-y)】的值注:x*x*x-y*y*y=(x-y)*(x*x+xy+y*y)
(x-y)(x+y)-(x+y)+2y(y-x),其中x=1,y=3
2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1解方程组 2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1
2(x+y)-(x-3y)=13,4(x+y)+3(x-3y)=1
三分之一(x+y)-(x-y)=3,二分之一(x+y)+2(x-y)=1
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(3x²-2x²-2y)÷(x+y) 化简【3x²-2x(x+y)+y(2x-y)】÷(x+y)其中x=1/2 y=1/3
已知x=3分之1,y=二分之一,求代数式x-(x+y)+(x+2y)-(x+3y)+...-(x+13y)的值
把下列各式分解因式 x(x+y)(x-y)-x(y+x)² 2 已知2x+y=6,x-3y=1,求7y(x-3y)²把下列各式分解因式x(x+y)(x-y)-x(y+x)²7、已知2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
当x=-2/3,y=-1/2时,/x+y/+(x+y)=?
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;
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
通分计算:(1)2x-3/(x-1)(x-4) - x-2/(1-x)(4-x) (2)x平方-y平方/xy - xy-y平方/x(y-x)还有:先化简再求值: (1)2x/x平方y平方 + x/y平方-x平方 + y/(x-y)(x+y) 其中x=4 y=-3 (2)已知(
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化简 求值 x-{-5x-[-y+(-x+3y)+x]},其中x=-1,y=-2;
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2