3a-3b/10ab · 25a^2b^3/a^2-b^2x^2-4y^2 / x^2+2xy+y^2 ÷ x+2y / 2x^2+2xy

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3a-3b/10ab·25a^2b^3/a^2-b^2x^2-4y^2/x^2+2xy+y^2÷x+2y/2x^2+2xy3a-3b/10ab·25a^2b^3/a^2-b^2x^2-4y^2/x^2

3a-3b/10ab · 25a^2b^3/a^2-b^2x^2-4y^2 / x^2+2xy+y^2 ÷ x+2y / 2x^2+2xy
3a-3b/10ab · 25a^2b^3/a^2-b^2
x^2-4y^2 / x^2+2xy+y^2 ÷ x+2y / 2x^2+2xy

3a-3b/10ab · 25a^2b^3/a^2-b^2x^2-4y^2 / x^2+2xy+y^2 ÷ x+2y / 2x^2+2xy
原式=(x+2y)(x-2y)/(x+y)^2 × 2x(x+y)/x+2y
=(x-2y)/x+y ×2x(约分)
=2x(x-2y)/x+y