.
解一元二次方程十字相乘法专项练习题
(1) a-7a+6=0; (2)8x+6x-35=0;
22
(3)18x-21x+5=0; (4) 20-9y-20y=0; 2
2
(5)2x2+3x+1=0; (6)2y
(7)6x2-13x+6=0; (8)3a
(9)6x2-11x+3=0; (10)4m
(11)10x2-21x+2=0; (12)8m
(13)4n2+4n-15=0; (14)6a
(15)5x2-8x-13=0; (16)4x
(17)15x2+x-2=0; (18)6y
(19) 2(a+b) 2+(a+b)(a-b)-6(a-b) 2=0; (20)7(x
精品2
+y-6=0; 2
-7a-6=0; 2
+8m+3=0; 2
-22m+15=0; 2
+a-35=0; 2
+15x+9=0; 2
+19y+10=0; -1) 2+4(x-1)-20=0
.
参考答案: (1)(a-6)(a-1), (3)(3x-1)(6x-5), (5)(x+1)(2x+1), (7)(2x-3)(3x-2), (9)(2x-3)(3x-1), (11)(x-2)(10x-1), (13)(2n+5)(2n-3), (15)(x+1)(5x-13), (17)(3x-1)(5x=2), (19)(3a-b)(5b-a),
(2)(2x+5)(4x-7) (4)-(4y-5)(5y+4) (6)(y+2)(2y-3) (8)(a-3)(3a+2) (10)(2m+1)(2m+3) (12)(2m-3)(4m-5) (14)(2a+5)(3a-7) (16)(x+3)(4x+3) (18)(2y+5)(3y+2) (20)(x+1)(7x-17)
如有侵权请联系告知删除,感谢你们的配合!
精品