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1、11131517192123252729x2 3x 2x2 4x 21x4 6x2 822 x 3xy 2yx2 4x 3y2 7y 12x2 x 202p2 5p 3642x x 20a2 9ab 14b22222x y 5x y 6x3x2 11x 106x2 7x 522x2 15x 75x2 7x 6十字相乘法因式分解练习题22x7x64x22x156(ab) 24(ab) 34328 x 3x 28x10 a2 7a 10212 q 6q 8214 m 7m 18216 t2 2t 82218 a x 7ax 82220 x 11xy 18y22a3 4a2 12a224 2x 7x
2、 32226 5x 6xy 8y228 3a2 8a 42230 5a2b2 23ab 104222232 4x y 5x y 9y3510x2c 221xy 2y37(x25x 3)(x2 5x 2) 6d 2_34 6l 2 l 353638c 28m(x_ 222mn 15n21)(x 2)(x 3)(x 4) 24答案： 1 (x 1)(x 2)2 (x 1)(x 6) 3 (x 3)(x 7) 4 (x 3)(x 5)225(x24)(x22) 6(ab 1)(ab3)7 (xy)(x 2y)28x2(x4)(x7) 9(x1)(x 3)10(a2)(a5)11 (y3)(y 4)1
3、2(q2)(q4)13(x4)(x 5)14(m2)(m9)15 (p4)(p 9)2216 (t 2)(t 4)17 (x2 4)(x2 5) 18 (ax 1)(ax 8)19 (a 2b)(a 7b)220(x2y)(x9y) 21 x (y 1)(y6) 22 a(a 2)(a6)23(x2)(3x5)24(x 3)(2x 1)25 (2x 1)(3x 5)26(x2y)(5x 4y)27 (2x 1)(x7)28(a 2)(3a 2)29(x2)(5x3)30(5ab 2)(ab5)31(3ab 2xy)(ab5xy)32 y2(x2 1)(2x 3)(2x 3) 33 (2m 3n)(2m 5n) 34 (2l 5)(3l 7)35 (10x y)(x 2y) 36 (2m 3n)( 4m 5n)37 (x 1)(x 4)(x2 5x 3)38 (x 3)(x 2)(x2 x 8)
