化简(y-1/3)/(x-1/y),要过程.

化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 已知y=f(x)图像过(2.0),则y=f(x+3)-1的图像过点?y=f(x+1)的反函数过点? 化简(y-1/3)/(x-1/y),要过程. 1/(x-y)+1/(x+y)+2x/(x^2+y^2)+4x^3/(x^4+y^4)化简 y-1=k(x-3)恒过点? 化简,求值：[(x/y)-(y/x)]除以[(x/y)+(y/x)-2]除以[1+(y/x)],其中x=1/2,y=1/3 y(x+y)+(x-y)²-（x+y）（x-y）,其中x=-1/3,y=3 把(x-y)看作一个整体,化简:(1)5(x-y)+2(x-y)-4(x-y);(2)3(x-y²-4(x-y)+7（x-y)-6(x-y) y'=(x-y+1)/(x+y-3)通解 (x+y)(x-y)+4(y-1) 化简（x+y)+(2x+y/1*2)+(3x+y/2*3)+.+(9x+y/8*9) 化简:（x+y）+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9) 3（x-1)³y-（1-x）³z m(x-y)²-x+y x²(x+y)(y-x)-xy(x+y)(x-y) 因式分解 (x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2要讲解和答题 x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 设y=f(x)反函数为y=f-1(x),且y=x+1+f(3x-1)图像过点(1,2),则y=f-1(x)-3x必过点? 化简 1/7（-2x+3y)(-2x-3y)-10(x+y)的平方 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值