(1) 3x ²-8x-3 (2)12x ²-11x-15 (3)-12x ²-28+5 (4)3+8x-3x ² (5)x ²+144y ²-25xy (6)6x ²-7xy+2 急
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![(1) 3x ²-8x-3 (2)12x ²-11x-15 (3)-12x ²-28+5 (4)3+8x-3x ² (5)x ²+144y ²-25xy (6)6x ²-7xy+2 急](/uploads/image/z/5177218-58-8.jpg?t=%281%29+3x+%26%23178%3B-8x-3+%EF%BC%882%EF%BC%8912x+%26%23178%3B-11x-15+%EF%BC%883%EF%BC%89-12x+%26%23178%3B-28%2B5+%EF%BC%884%EF%BC%893%2B8x-3x+%26%23178%3B+%EF%BC%885%EF%BC%89x+%26%23178%3B%2B144y+%26%23178%3B-25xy+%EF%BC%886%EF%BC%896x+%26%23178%3B-7xy%2B2+%E6%80%A5)
(1) 3x ²-8x-3 (2)12x ²-11x-15 (3)-12x ²-28+5 (4)3+8x-3x ² (5)x ²+144y ²-25xy (6)6x ²-7xy+2 急
(1) 3x ²-8x-3 (2)12x ²-11x-15 (3)-12x ²-28+5 (4)3+8x-3x ² (5)x ²+144y ²-25xy (6)6x ²-7xy+2 急
(1) 3x ²-8x-3 (2)12x ²-11x-15 (3)-12x ²-28+5 (4)3+8x-3x ² (5)x ²+144y ²-25xy (6)6x ²-7xy+2 急
(1) 3x ²-8x-3=(3x+1)(x-3)
(2)12x ²-11x-15=(3x-5)(4x+3)
(3)-12x ²-28x+5 =(5+2x)(1-6x)
(4)3+8x-3x ² =(3-x)(1+3x)
(5)x ²+144y ²-25xy =(x-16y)(x-9y)
(6)6x ²-7xy+2y²=(2x-y)(3x-2y)
(1)原式=3x ²-8x-3=(3x+1)(x-3)
(2)原式=12x ²-11x-15 =(3x-5)(4x+3)
(3)原式=-12x ²-28+5=(2x+5)(-6x+1)
(4)原式=3+8x-3x ²=(3x+1)(-x+3)
(5)原式=x ²+144y ²-25xy =(x-12y)^2-xy
第(6)题不会
1,x(3x-8)-3
2,x(12x-11)-15
3,-4(3x2+7)+5
4,x(8-3x)+3
5,(x-12y)2-xy
6,x(6x-7y)+2
1,(3x+1)(x-3)
2,(3x-5)(4x+3)
3,你打错了
4,-(3x+1)(x-3)
5,(x-16y)(x-9y)