【自主领悟】
1、B
2、(1)x₁ =
,x₂ = -
;
(2)x₁ = x₂ = 2;
(3)x₁ = 2,x₂ = -1.
【自主检测】
1、x₁ = -3,x₂ = 4
2、0或-2.
3、(1)x₁ = 0,x₂ = 2;
(2)x₁ = 3,x₂ = 3/5;
(3)x₁ = -6/7,x₂ = -14/3;
(4)x₁ = -1,x₂ = 3/2;
(5)x₁ = 0,x₂ = 7/3;
(6)x₁ = x₂ = 5.
4、设原菜地的长为x m,则宽为(x - 2)m根据题意,
得x(x - 2)= 120.解得x₁ = 12,x₂ = -10(不合题意,舍去).
【自主拓展】
1、(x-1)(x-2)
2、(1)x₁ = b/a,x₂ = a/b;
(2)x₁ = m,x₂ = 2m - 1.