若|2x+y-3|+(x-1/2y)^2=0,求4x^2-2y-y^2-1的值用分组分解法
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若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
x(x-y)2-(y-x)3
若变量x,y满足约束条件{x>=-1;y>=x;3x+2y
若x=-1/4,能否确定代数式(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)的值?
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()
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
化简:{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x
计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
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(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
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若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若x*x+y*y=x+y-1/2,求x,y的值如题
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
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