若x-y=1 化简(x+y)(x^2+y^2)(x^4+y^4)(x^8+y^8)(x^16+y^16)
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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x-y=1 化简(x+y)(x^2+y^2)(x^4+y^4)(x^8+y^8)(x^16+y^16)
化简 x / y(x+y) - y / x(x+y) =
化简y(x+y)+(x+y)(x-y)-x^2
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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-y)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3.
2y(x+二分之一y)-[(x+y)(x-y)+2y(y+x)],其中|x-1|=2
若变量x,y满足约束条件{x>=-1;y>=x;3x+2y
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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()
已知x+y=a,2x-y=-2a,求[(x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值
x^/y-x-y^/y-x化简.
化简x(y-x)-y(x-y)