因式分解:1.3x^2-4xy-4y^2-6x-4y 2.2x^2+5x-6 3.3x^2+7x-6 4.解方程:(2x
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因式分解:
1.3x^2-4xy-4y^2-6x-4y
2.2x^2+5x-6
3.3x^2+7x-6
4.解方程:
(2x-3)^2+3(2x-3)+2=0
5.已知(3x-2y)^2-10(3x-2y)+25=0,求9x^2-12xy+4y^2+1的值.
1.3x^2-4xy-4y^2-6x-4y
2.2x^2+5x-6
3.3x^2+7x-6
4.解方程:
(2x-3)^2+3(2x-3)+2=0
5.已知(3x-2y)^2-10(3x-2y)+25=0,求9x^2-12xy+4y^2+1的值.
![因式分解:1.3x^2-4xy-4y^2-6x-4y 2.2x^2+5x-6 3.3x^2+7x-6 4.解方程:(2x](/uploads/image/z/527774-14-4.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A1.3x%5E2-4xy-4y%5E2-6x-4y+2.2x%5E2%2B5x-6+3.3x%5E2%2B7x-6+4.%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%9A%EF%BC%882x)
1.(x-2y-2)(3x+2y)
2.2(x+5/4+根号下73)(x+5/4-根号下73)
3.(x+3)(3x-2)
4.(2x-3)^2+3(2x-3)+2=(2x-3+1)^2(2x-3+2)^2=(2x-2)^2(2x-1)^2
5.(3x-2y)^2-10(3x-2y)+25=(3x-2y-5)^2=0,故3x-2y=5,故9x^2-12xy+4y^2+1=(3x-2y)^2+1=26
2.2(x+5/4+根号下73)(x+5/4-根号下73)
3.(x+3)(3x-2)
4.(2x-3)^2+3(2x-3)+2=(2x-3+1)^2(2x-3+2)^2=(2x-2)^2(2x-1)^2
5.(3x-2y)^2-10(3x-2y)+25=(3x-2y-5)^2=0,故3x-2y=5,故9x^2-12xy+4y^2+1=(3x-2y)^2+1=26
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