问题
解答题
(1)解方程:x2+2x-3=0; (2)计算:
|
答案
(1)由原方程,得
(x-1)(x+3)=0,
∴x-1=0或x+3=0,
解得,x=1或x=-3;
(2)原式=3
÷3
-23
×32 2
=3-12
=-9.
(1)解方程:x2+2x-3=0; (2)计算:
|
(1)由原方程,得
(x-1)(x+3)=0,
∴x-1=0或x+3=0,
解得,x=1或x=-3;
(2)原式=3
÷3
-23
×32 2
=3-12
=-9.