因式分解之十字相乘法专项练习题

因式分解之十字相乘法专项练习题(1) a 2 7a+6 ；(2)8x 2+6x 35 ；(3)18x 221x+5 ；(4) 20 9y 20y 2 ；(5)2x 2 +3x+1 ；(6)2y 2+y 6 ；(7)6x 2 13x+6 ；(8)3a 2 7a 6；(9)6x 2 11x+3 ；(10)4m 2 +8m+3 ；(11)10x 2 21x+2 ；(12)8m 2 22m+15 ；精品资料(13)4n 2+4n 15 ；(14)6a 2+a 35 ；(15)5x 28x 13；(16)4x 2+15x+9 ；(17)15x 2+x 2 ；(18)6y 2+19y+10 ；(19) 2(a+b) 2+(a+b)(a b) 6(a b) 2 ；(20)7(x 1) 2+4(x 1) 20 ；参考答案：(1)(a-6)(a-1)，(2)(2x+5)(4x-7)(3)(3x-1)(6x-5)，(4)-(4y-5)(5y+4)(5)(x+1)(2x+1)，(6)(y+2)(2y-3)(7)(2x-3)(3x-2)，(8)(a-3)(3a+2)(9)(2x-3)(3x-1)，(10)(2m+1)(2m+3)(11)(x-2)(10x-1)，(12)(2m-3)(4m-5)(13)(2n+5)(2n-3)，(14)(2a+5)(3a-7)(15)(x+1)(5x-13)，(16)(x+3)(4x+3)(17)(3x-1)(5x=2)，(18)(2y+5)(3y+2)(19)(3a-b)(5b-a)，(20)(x+1)(7x-17)十字相乘法习题1.x 24. x23x218 x172. x26 x53. x 212x115. x 24x36. x24x37. x 22 x38. x22x39. x 27x610. x25x611.x 2x612. x2x613. 2526aa 214.x 4x 22015. x46x2816.x47 x21817.x23xy2 y218.a 29ab14b 219.a 2 x27ax82220. m n3mn1021.y 213 yb36b222.a210a923.a34a212a24.x2 y25x2 y6x225.(ab) 24( ab) x326.( x2 y) 23( x2 y)1027.222( x4 x)7(x4x)1228.( x3)4 x29.( x5x3)( x5x2)62222230. ( x1)( x2)( x3)( x4)2431.2 x2x332.2 x25 x733.3a22a134.3b 214b535.2 x215x736.3a 28a437.5 x27 x638.6 y211 y1039. 12 x213x3x1340. 4x224 x2741. 5x26x842. 2 x243. 6 y213 y644. 3a27a645. 4n24n1546. 6x2x3547. 5x28x1348.15 x2x249. 209 y20 y250. 5a 2b 223ab1051.3a 2b 217abxy10 x2 y252.5x515x3 y20xy253.2x（x12） 2254.3( x2 y) 439(x2 y)21082255. x10 xy25 y6 x30 y854.3x2 y