问题
解答题
(1)计算:cos260°+sin245°-tan60° (2)|-3|+(-1)2011×(π-3)0-
|
答案
(1)原式=(
)2+(1 2
)2-2 2
=3
+1 4
-1 2
=3
;3-4 3 4
(2)原式=3+(-1)×1-3+2=3-1-3+2=1.
(1)计算:cos260°+sin245°-tan60° (2)|-3|+(-1)2011×(π-3)0-
|
(1)原式=(
)2+(1 2
)2-2 2
=3
+1 4
-1 2
=3
;3-4 3 4
(2)原式=3+(-1)×1-3+2=3-1-3+2=1.