a2*a2-b2/b-ab2÷(1+a2+b2/2ab)

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a2*a2-b2/b-ab2÷(1+a2+b2/2ab)a2*a2-b2/b-ab2÷(1+a2+b2/2ab)a2*a2-b2/b-ab2÷(1+a2+b2/2ab)原式=-a²(a+b)

a2*a2-b2/b-ab2÷(1+a2+b2/2ab)
a2*a2-b2/b-ab2÷(1+a2+b2/2ab)

a2*a2-b2/b-ab2÷(1+a2+b2/2ab)
原式=-a²(a+b)(a-b)/b(1-ab)÷(a+b)²/2ab
=-a²(a+b)(a-b)/b(1-ab)×2ab/(a+b)²
=-2a³(a-b)/(1-ab)(a+b)