(-x+2x²+5)+(4x²-3-6x) (3a²-ab+7)-(-4a²+2ab+7) 3分钟内要5(3a²b-ab²)-(ab²+3a²b)a=1/2 b=1/3
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![(-x+2x²+5)+(4x²-3-6x) (3a²-ab+7)-(-4a²+2ab+7) 3分钟内要5(3a²b-ab²)-(ab²+3a²b)a=1/2 b=1/3](/uploads/image/z/1627064-8-4.jpg?t=%28-x%2B2x%26%23178%3B%2B5%29%2B%EF%BC%884x%26%23178%3B-3-6x%EF%BC%89+%283a%26%23178%3B-ab%2B7%29-%EF%BC%88-4a%26%23178%3B%2B2ab%2B7%EF%BC%89+3%E5%88%86%E9%92%9F%E5%86%85%E8%A6%815%283a%26%23178%3Bb-ab%26%23178%3B%29-%28ab%26%23178%3B%2B3a%26%23178%3Bb%29a%3D1%2F2+b%3D1%2F3)
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(-x+2x²+5)+(4x²-3-6x) (3a²-ab+7)-(-4a²+2ab+7) 3分钟内要5(3a²b-ab²)-(ab²+3a²b)a=1/2 b=1/3
(-x+2x²+5)+(4x²-3-6x) (3a²-ab+7)-(-4a²+2ab+7) 3分钟内要
5(3a²b-ab²)-(ab²+3a²b)
a=1/2 b=1/3
(-x+2x²+5)+(4x²-3-6x) (3a²-ab+7)-(-4a²+2ab+7) 3分钟内要5(3a²b-ab²)-(ab²+3a²b)a=1/2 b=1/3
数字代入就可以了啊