题目内容
解方程:
(1)2x2-7x=4;
(2)x+3-x(x+3)=0.
(1)2x2-7x=4;
(2)x+3-x(x+3)=0.
(1)移项得:2x2-7x-4=0,
(2x+1)(x-4)=0,
x-4=0,2x+1=0,
x1=4,x2=-
;
(2)x+3-x(x+3)=0,
(x+3)(1-x)=0,
x+3=0,1-x=0,
x1=-3,x2=1.
(2x+1)(x-4)=0,
x-4=0,2x+1=0,
x1=4,x2=-
1 |
2 |
(2)x+3-x(x+3)=0,
(x+3)(1-x)=0,
x+3=0,1-x=0,
x1=-3,x2=1.
练习册系列答案
相关题目