问题
填空题
方程x2-4=0的解为______,方程(x-1)(x+2)=0的解为______.
答案
(1)x2-4=0
x2=4
x=±2;
(2)(x-1)(x+2)=0
x-1=0或x+2=0
x=1或x=-2.
方程x2-4=0的解为______,方程(x-1)(x+2)=0的解为______.
(1)x2-4=0
x2=4
x=±2;
(2)(x-1)(x+2)=0
x-1=0或x+2=0
x=1或x=-2.