问题
解答题
计算 (1)(-3)2-2÷(-
(2)
(3)180°-(38°45′+72.5°) |
答案
(1)原式=9-2×(-2)
=9+4
=13;
(2)原式=-4+4×
÷23 2
=-4+4×
×3 2 1 2
=-4+3
=-1;
(3)原式=180°-(38°45′+72°30′)
=179°60′-111°15′
=68°45′.
计算 (1)(-3)2-2÷(-
(2)
(3)180°-(38°45′+72.5°) |
(1)原式=9-2×(-2)
=9+4
=13;
(2)原式=-4+4×
÷23 2
=-4+4×
×3 2 1 2
=-4+3
=-1;
(3)原式=180°-(38°45′+72°30′)
=179°60′-111°15′
=68°45′.