问题
解答题
(1)计算:
(2)解方程:x2+2x-3=0 |
答案
(1)原式=2
-2×2
-2×2 2 2 2
=2
-2
-2 2
=0;
(2) x2+2x-3=0,
(x+3)(x-1)=0,
x1=-3,x2=1.
(1)计算:
(2)解方程:x2+2x-3=0 |
(1)原式=2
-2×2
-2×2 2 2 2
=2
-2
-2 2
=0;
(2) x2+2x-3=0,
(x+3)(x-1)=0,
x1=-3,x2=1.