问题
解答题
计算(或化简)下列各式: (1)计算:(-1.8)0+(1.5)-2×(3
(2)化简:(tan10°-
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答案
(1)原式=1+(
)-2×[(3 2
)3]3 2
-10(-2)×(-0.5)+log2 3
21 2 5 4
=1+(
)0-10-3 2 5 4
=-9.25;
(2)原式=(
-sin10° cos10°
)•3 cos10° sin50°
=
×sin10°-
cos10°3 cos10° cos10° sin50°
=2(
sin10°-1 2
cos10°)3 2 sin50°
=2sin(-50°) sin50°
=-2.