问题
解答题
计算 (1)-1+2×3; (2)(-3)2÷
(3)
(4)90°-45°58′; (5)38°36′+72.5°(结果用度表示) |
答案
(1)原式=-1+2×3
=5;
(2)原式=9×
+82 3
=14;
(3)原式=
-1 4 3 4
=-
;1 2
(4)90°-45°58′=44°2′;
(5)38°36′+72.5°=38.6°+72.5°=111.1°.
计算 (1)-1+2×3; (2)(-3)2÷
(3)
(4)90°-45°58′; (5)38°36′+72.5°(结果用度表示) |
(1)原式=-1+2×3
=5;
(2)原式=9×
+82 3
=14;
(3)原式=
-1 4 3 4
=-
;1 2
(4)90°-45°58′=44°2′;
(5)38°36′+72.5°=38.6°+72.5°=111.1°.