X^2 + Y^2 = 25 (X^2 X的平方)X - Y = 1

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X^2 + Y^2 = 25 (X^2 X的平方)X - Y = 1
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X^2 + Y^2 = 25 (X^2 X的平方)X - Y = 1
X^2 + Y^2 = 25 (X^2 X的平方)
X - Y = 1

X^2 + Y^2 = 25 (X^2 X的平方)X - Y = 1
X - Y = 1
(x-y)²=x²-2xy+y²=1,而X^2 + Y^2 = 25
于是2xy=24
（x+y）²=x²+2xy+y²=25+24=49
于是x+y=±7,而x-y=1
于是x1=4,x2=-3

两端对x求导得： f

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 填空：x-y/x+y=( )/x^2-y^2 因式分解x(x+y)(x-y)-x(x+y)^2 （x-y)2•(y-x)³(x-y)=? y=x^2-2x（x y=x^2+2x(x 3^x+2x=y,x (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) x²-(x-2y)(x+2y)+(x²-y)(y+x²)=? 化简y(x+y)+(x+y)(x-y)-x^2 (12-2x)/X=(-16-2Y)/Y X^2+Y^2=25 Y (x-4y)(2x+y)= (x+y)(2x-3y)=? x+y>=2,x-y x+y>=2,x-y