通分(1)x/4y与3x/2y;
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通分(1)x/4y与3x/2y;
(1)x/4y与3x/2y;
(2)x-1/x^2+x与x/x^2-x;
(3)2xy/(x+y)^2与x/x^2-y^2;
(4)1/2y-2与1/y+1
(1)x/4y与3x/2y;
(2)x-1/x^2+x与x/x^2-x;
(3)2xy/(x+y)^2与x/x^2-y^2;
(4)1/2y-2与1/y+1
(1)x/4y 6x/4y
(2)x-1/x^2+x=x-1/x(x+1) x/x^2-x=x/x(x-1)
然后最小公倍数是x(x+1)(x-1)
通分之后是(x-1)^2/x(x+1)(x-1)
x(x+1)/x(x+1)(x-1)
(3) x/x^2-y^2= x/(x-y)(x+y)
最小公倍数是(x-y)(x+y)(x+y)
通分之后是2xy(x-y)/(x-y)(x+y)(x+y)
x(x+y))/(x-y)(x+y)(x+y)
(4)最小公倍数是(2y-2)(y+1)
通分之后(y+1)/(2y-2)(y+1)
(2y-2)/(2y-2)(y+1)
总之就是可以化简的先化简,化简之后找分母的最小公倍数
就可以做了
(2)x-1/x^2+x=x-1/x(x+1) x/x^2-x=x/x(x-1)
然后最小公倍数是x(x+1)(x-1)
通分之后是(x-1)^2/x(x+1)(x-1)
x(x+1)/x(x+1)(x-1)
(3) x/x^2-y^2= x/(x-y)(x+y)
最小公倍数是(x-y)(x+y)(x+y)
通分之后是2xy(x-y)/(x-y)(x+y)(x+y)
x(x+y))/(x-y)(x+y)(x+y)
(4)最小公倍数是(2y-2)(y+1)
通分之后(y+1)/(2y-2)(y+1)
(2y-2)/(2y-2)(y+1)
总之就是可以化简的先化简,化简之后找分母的最小公倍数
就可以做了
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