4(a+2)²-9(a-1)²a²(a-b)+b²(b-a)(x+2)(x+4)+x²-4抱歉.上次你帮我解答,忘了给你分了
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![4(a+2)²-9(a-1)²a²(a-b)+b²(b-a)(x+2)(x+4)+x²-4抱歉.上次你帮我解答,忘了给你分了](/uploads/image/z/5629591-55-1.jpg?t=4%28a%2B2%29%26%23178%3B%EF%BC%8D9%28a%EF%BC%8D1%29%26%23178%3Ba%26%23178%3B%28a-b%29%2Bb%26%23178%3B%EF%BC%88b%EF%BC%8Da%EF%BC%89%EF%BC%88x%2B2%EF%BC%89%EF%BC%88x%2B4%EF%BC%89%2Bx%26%23178%3B-4%E6%8A%B1%E6%AD%89.%E4%B8%8A%E6%AC%A1%E4%BD%A0%E5%B8%AE%E6%88%91%E8%A7%A3%E7%AD%94%2C%E5%BF%98%E4%BA%86%E7%BB%99%E4%BD%A0%E5%88%86%E4%BA%86)
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4(a+2)²-9(a-1)²a²(a-b)+b²(b-a)(x+2)(x+4)+x²-4抱歉.上次你帮我解答,忘了给你分了
4(a+2)²-9(a-1)²
a²(a-b)+b²(b-a)
(x+2)(x+4)+x²-4
抱歉.上次你帮我解答,忘了给你分了
4(a+2)²-9(a-1)²a²(a-b)+b²(b-a)(x+2)(x+4)+x²-4抱歉.上次你帮我解答,忘了给你分了
4(a+2)²-9(a-1)²=[2(a+2)+3(a-1)][2(a+2)-3(a-1)]=(5a+1)(-a+7)=-(5a+1)(a-7)
或(5a+1)(7-a)
a²(a-b)+b²(b-a)=a²(a-b)-b²(a-b)=(a-b)(a²-b²)=(a-b)²(a+b)
(x+2)(x+4)+x²-4=(x+2)(x+4)+(x+2)(x-2)=(x+2)(x+4+x-2)=(x+2)(2x+2)=2(x+2)(x+1)