「(x²+y²)-(x-y)²+2y(x-y)」÷4y,其中2x-y=18

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「(x²+y²)-(x-y)²+2y(x-y)」÷4y,其中2x-y=18
「(x²+y²)-(x-y)²+2y(x-y)」÷4y,其中2x-y=18

「(x²+y²)-(x-y)²+2y(x-y)」÷4y,其中2x-y=18
「(x²+y²)-(x-y)²+2y(x-y)」÷4y
=(x²+y²-x²+2xy-y²+2xy-2y²)÷4y
=(4xy-2y²)÷4y
=x-y/2