要求,(-x+2x^2+5)+(4x^2-3-6x)= (3a^2-ab+7)-(-4ab^2+2ab+7)
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要求,(-x+2x^2+5)+(4x^2-3-6x)= (3a^2-ab+7)-(-4ab^2+2ab+7)
![要求,(-x+2x^2+5)+(4x^2-3-6x)= (3a^2-ab+7)-(-4ab^2+2ab+7)](/uploads/image/z/16028504-8-4.jpg?t=%E8%A6%81%E6%B1%82%2C%EF%BC%88-x%2B2x%5E2%2B5%29%2B%284x%5E2-3-6x%29%3D+%EF%BC%883a%5E2-ab%2B7%29-%28-4ab%5E2%2B2ab%2B7%29)
(-x+2x^2+5)+(4x^2-3-6x)
=-x+2x^2+5+4x^2-3-6x
=6x^2-7x+2
(3a^2-ab+7)-(-4ab^2+2ab+7)
=3a^2-ab+7+4ab^2-2ab-7
=3a^2-3ab+4ab^2
=-x+2x^2+5+4x^2-3-6x
=6x^2-7x+2
(3a^2-ab+7)-(-4ab^2+2ab+7)
=3a^2-ab+7+4ab^2-2ab-7
=3a^2-3ab+4ab^2
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