问题
解答题
(1)解方程:(x+1)2-144=0; (2)计算:6tan230°-
|
答案
(1)∵原方程可化为:(x+1)2=144,
∴x+1=±12,
∴x1=11,x2=-13;
(2)原式=6×(
)2-3 3
×3
+2×13 2
=2-
+23 2
=
.5 2
(1)解方程:(x+1)2-144=0; (2)计算:6tan230°-
|
(1)∵原方程可化为:(x+1)2=144,
∴x+1=±12,
∴x1=11,x2=-13;
(2)原式=6×(
)2-3 3
×3
+2×13 2
=2-
+23 2
=
.5 2