解一元二次方程专项练习题
(1) a2-7a+6=0; (2)8x2+6x-35=0;
(3)18x2-21x+5=0; (4) 20-9y-20y2=0;
(5)2x2+3x+1=0; (6)2y2+y-6=0;
(7)6x2-13x+6=0; (8)3a2-7a-6=0;
(9)6x2-11x+3=0; (10)4m2+8m+3=0;
(11)10x2-21x+2=0; (12)8m2-22m+15=0;
(13)4n2+4n-15=0; (14)6a2+a-35=0;
(15)5x2-8x-13=0; (16)4x2+15x+9=0;
(17)15x2+x-2=0; (18)6y2+19y+10=0;
(19) 2(a+b) 2+(a+b)(a-b)-6(a-b) 2=0; (20)7(x-1) 2+4(x-1)-20=0
二、利用公式法解下列方程
(1) (2) (3)x=4x2+2
(4)-4x 2+8x=8 (5)2x(x-3)=x-3 (6) 3x2+5(2x+1)=0
(7)(x+1)(x+8)=-12 (8)2(x-3) 2=x 2-9 (9)x 2-6x-2=0
配方法(1)3x2-5x=2. (2)x2+8x=9
(3)x2+12x-15=0 (4) x2-x-4=0
参考
答案
八年级地理上册填图题岩土工程勘察试题省略号的作用及举例应急救援安全知识车间5s试题及答案
:
(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)