1、(x + 4)(x - 4) = 0,x + 4 = 0,x - 4 = 0,-4,4
2、y₁ = 0,y₂ = 1,x₁ = 0,x₂ = 2
3、D
4、(1)x₁ = 0,x₂ = 2;
(2)y₁ = 0,y₂ = -3;
(3)x₁ = 1,x₂ = -1;
(4)x₁ = -2,x₂ = 2;
(5)x₁ = 2,x₂ = 3;
(6)x₁ = 0,x₂ = 2
5、(1)x₁ = x₂ = 3;
(2)x₁ = 3,x₂ = 2;
(3)x₁ = x₂ = 1;
(4)x₁ = 1/5,x₂ = 4/5
6、x₁ = 8,x₂ = -4,y₁ = 2,y₂ = -3
7、(x + 1)(x - 2) = 0(答案不唯一)
8、B
9、(1)x₁ = 0,x₂ = 11/4;
(2)x₁ = 1/2,x₂ = 3/4;
(3)x₁ = 2,x₂ = 4;
(4)x₁ = 1/5,x₂ = -1;
(5)x₁ = -1/5,x₂ = -3;
(6)x₁ = 2,x₂ = 6;
(7)x₁ = -3,x₂ = -5;
(8)x₁ = x₂ = 1
10、(1)x₁ = 1,x₂ = 2;
(2)x₁ = 4,x₂ = -1;
(3)x₁ = -2,x₂ = -3;
(4)x₁ = -5,x₂ = 1;
(5)x₁ = 1,x₂ = 7;
(6)x₁ = -3,x₂ = -6;