合并同类项 2(a+b)²-7(a-b)³+3(b-a)²-(b-a)³
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![合并同类项 2(a+b)²-7(a-b)³+3(b-a)²-(b-a)³](/uploads/image/z/7259626-10-6.jpg?t=%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9+2%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B-7%EF%BC%88a-b%EF%BC%89%26%23179%3B%2B3%EF%BC%88b-a%EF%BC%89%26%23178%3B-%EF%BC%88b-a%EF%BC%89%26%23179%3B)
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合并同类项 2(a+b)²-7(a-b)³+3(b-a)²-(b-a)³
合并同类项 2(a+b)²-7(a-b)³+3(b-a)²-(b-a)³
合并同类项 2(a+b)²-7(a-b)³+3(b-a)²-(b-a)³
2(a+b)²-7(a-b)³+3(b-a)²-(b-a)³
=2(a+b)²-7(a-b)³+3(b-a)²+(a-b)³
=2(a+b)²-6(a-b)³+3(b-a)²
原式=2(a+b)^2-7(a-b)^3+3(b-a)^2+(a-b)^3
=2(a+b)^2-6(a-b)^3+3(b-a)^3
展开,合并同类项,得原式= - 6a³ + 18a²b - 18ab²+6b³+5a² - 2ab+5b²