初一:因式分解:ab+b²+a-b-2ab+b²+a-b-2 2.a²-b²+2b-1 3.x^7-2x^6y+x^5y^2 4.a²-ab+2bc-4c²
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![初一:因式分解:ab+b²+a-b-2ab+b²+a-b-2 2.a²-b²+2b-1 3.x^7-2x^6y+x^5y^2 4.a²-ab+2bc-4c²](/uploads/image/z/1786802-50-2.jpg?t=%E5%88%9D%E4%B8%80%EF%BC%9A%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9Aab%2Bb%26%23178%3B%2Ba-b-2ab%2Bb%26%23178%3B%2Ba-b-2++++++++++++++++++++++++2.a%26%23178%3B-b%26%23178%3B%2B2b-1+++++3.x%5E7-2x%5E6y%2Bx%5E5y%5E2+++++++++++++++++++4.a%26%23178%3B-ab%2B2bc-4c%26%23178%3B)
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初一:因式分解:ab+b²+a-b-2ab+b²+a-b-2 2.a²-b²+2b-1 3.x^7-2x^6y+x^5y^2 4.a²-ab+2bc-4c²
初一:因式分解:ab+b²+a-b-2
ab+b²+a-b-2 2.a²-b²+2b-1
3.x^7-2x^6y+x^5y^2 4.a²-ab+2bc-4c²
初一:因式分解:ab+b²+a-b-2ab+b²+a-b-2 2.a²-b²+2b-1 3.x^7-2x^6y+x^5y^2 4.a²-ab+2bc-4c²
1、ab+b²+a-b-2
=ab+a+(b²-b-2)
=a(b+1)+(b-2)(b+1)
=(a+b-2)(b+1)
2、a²-b²+2b-1
=a²-(b²-2b+1)
=a²-(b-1)²
=(a+b-1)(a-b+1)
3、x^7-2x^6y+x^5y^2
=x^5·(x²-2xy+y²)
=x^5·(x-y)²
4、a²-ab+2bc-4c²
=a²-4c²-(ab-2bc)
=(a+2c)(a-2c)-b(a-2c)
=(a+2c-b)(a-2c)
(b+a-2)(b+1) (a+b-1)(a-b+1) x^5(x-y)^2 (a+2c)(a-b-2c)
(b+1)(a+b-2)