若x^2y^2
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
若f(x+y,y/x)=x^2-y^2,则F(X,Y)=
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
化简y(x+y)+(x+y)(x-y)-x^2
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若x、y互为相反数,则x+2x+3x+...100x+100y+99y+98y+...+y
(x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(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)
若2x=3y,则(x*x+y*y)/x*x=?
因式分解x(x+y)(x-y)-x(x+y)^2
若集合A={(x,y)|y>=|x-2|} ,B={(x,y)|y
[(x-y)^2-(x+2y)(x-2y)]/y
计算:y-x分之x+y+x-y分之y-y-x分之2x-y
化简(x^2-y^2)/(x+y)解法一:(x^2-y^2)/(x+y)=(x+y)(x-y)/(x+y)=x-y解法二:(x^2-y^2)/(x+y)=(x^2-y^2)(x-y)/(x+y)(x-y)=(x^2-y^2)(x-y)/(x^2-y^2)=x-y你认为小红同学的两种解法对吗?若解法错误,请说明原因
x^2(x-y)+(y-x)
x(x-y)2-(y-x)3