（X+Y-3)(X-Y+3)
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（X+Y-3)(X-Y+3)（X+Y-3)(X-Y+3)（X+Y-3)(X-Y+3)(X+Y-3)(X-Y+3)=[X+(Y-3)][X-(Y-3)]=X²-(Y-3)²（X+Y-
（X+Y-3)(X-Y+3)
（X+Y-3)(X-Y+3)
（X+Y-3)(X-Y+3)
(X+Y-3)(X-Y+3)
=[X+(Y-3)][X-(Y-3)]
=X²-(Y-3)²
（X+Y-3)(X-Y+3)
=[X+(Y-3)][X-(Y-3)]
=X^2-(Y-3)^2
=X^2-(y^2-6Y+9)
=X^2-Y^2+6Y-9
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[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x
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3x+4y/x-y +3y/y-x -4x/x-y
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（x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.
计算：(x+3y)(x-3y)-(x-3y)
(x+3y)(x-3y)-(x-3y)²