(x+y–5)(x-y+5)
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(x+y–5)(x-y+5)(x+y–5)(x-y+5)(x+y–5)(x-y+5)(x+y-5)(x-y+5)=(x+y)²-5²=x²+y²+2xy-25
(x+y–5)(x-y+5)
(x+y–5)(x-y+5)
(x+y–5)(x-y+5)
(x+y-5)(x-y+5)
=(x+y)²-5²
=x²+y²+2xy-25
(x+y–5)(x-y+5)
(x-y)^3×(y-x)^4+(x-y)^2×(y-x)^5
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若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
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[(x+2y)²-(x-y)(x+2y)-5y²]÷(2y)