问题 解答题
计算(或化简)下列各式:
(1)计算:(-1.8)0+(1.5)-2×(3
3
8
)
2
3
-(0.01)-0.5+log
1
2
432

(2)化简:(tan10°-
3
)•
cos10°
sin50°
答案

(1)原式=1+(

3
2
-2×[(
3
2
)3]
2
3
-10(-2)×(-0.5)+log
1
2
2
5
4

=1+(

3
2
0-10-
5
4

=-9.25;

(2)原式=(

sin10°
cos10°
-
3
)•
cos10°
sin50°

=

sin10°-
3
cos10°
cos10°
×
cos10°
sin50°

=

2(
1
2
sin10°-
3
2
cos10°)
sin50°

=

2sin(-50°)
sin50°

=-2.

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