问题
解答题
(1)计算:cos30°+(
(2)解不等式组:
|
答案
(1)原式=
+3×1-2-3 2
=1.3 2
(2)
,2(x+7)≤3x+3①
<x 3
+1②x+1 4
解①得,x≥11,
解②得,x<15,
故不等式的解集为:11≤x<15.
(1)计算:cos30°+(
(2)解不等式组:
|
(1)原式=
+3×1-2-3 2
=1.3 2
(2)
,2(x+7)≤3x+3①
<x 3
+1②x+1 4
解①得,x≥11,
解②得,x<15,
故不等式的解集为:11≤x<15.