问题
解答题
(1)计算:2sin30°+2
(2)解方程:
|
答案
(1)原式=2×
+21 2
×3
-3 1 2
=1+6-1 2
=6
;1 2
(2)分解因式得:
x(x+1)=0,1 2
x=0,x+1=0,1 2
x1=0,x2=-1.
(1)计算:2sin30°+2
(2)解方程:
|
(1)原式=2×
+21 2
×3
-3 1 2
=1+6-1 2
=6
;1 2
(2)分解因式得:
x(x+1)=0,1 2
x=0,x+1=0,1 2
x1=0,x2=-1.