6X^2-13xy+6y2 4x^2-37x^2y^2+9y^4 4m^2+8mn+3n^2 (a^2-a)x-(ab+
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6X^2-13xy+6y2 4x^2-37x^2y^2+9y^4 4m^2+8mn+3n^2 (a^2-a)x-(ab+2b)x-6b^2 3x^2-2(2a+1)x+a^2-1 x^4-3x^3-28x^2 (x^2=2x)^2-7(x^2+2x)-8 最好详细一些.如果好的话,
![6X^2-13xy+6y2 4x^2-37x^2y^2+9y^4 4m^2+8mn+3n^2 (a^2-a)x-(ab+](/uploads/image/z/1539892-28-2.jpg?t=6X%5E2-13xy%2B6y2+4x%5E2-37x%5E2y%5E2%2B9y%5E4+4m%5E2%2B8mn%2B3n%5E2+%28a%5E2-a%29x-%28ab%2B)
主要是用十字相乘法.
1.原式=(3x-2y)(2x-3y)
2.原式=4x^4-12x^2y^2+9y^4-25x^2y^2
=(2x^2-3y^2)^2-(5xy)^2
=(2x^2+5xy-3y^2)(2x^2-5xy-3y^2)
=(x+3y)(2x-y)(x-3y)(2x+y)
3.原式=(m+3n)(2m+n)
4.原式=[(a-1)x-3b)](ax+2b)
=(ax-x-3b)(ax+2b)
5.原式=(x-a-1)(3x-a+1)
6.原式=x^2(x^2-3x-28)
=x^2(x-7)(x+4)
7.原式=(x^2+2x+1)(x^2+2x-8)
=(x+1)^2(x-2)(x+4)
若楼主还有什么不懂的话尽管告诉我.
1.原式=(3x-2y)(2x-3y)
2.原式=4x^4-12x^2y^2+9y^4-25x^2y^2
=(2x^2-3y^2)^2-(5xy)^2
=(2x^2+5xy-3y^2)(2x^2-5xy-3y^2)
=(x+3y)(2x-y)(x-3y)(2x+y)
3.原式=(m+3n)(2m+n)
4.原式=[(a-1)x-3b)](ax+2b)
=(ax-x-3b)(ax+2b)
5.原式=(x-a-1)(3x-a+1)
6.原式=x^2(x^2-3x-28)
=x^2(x-7)(x+4)
7.原式=(x^2+2x+1)(x^2+2x-8)
=(x+1)^2(x-2)(x+4)
若楼主还有什么不懂的话尽管告诉我.
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