问题
解答题
计算 (1)(
(3)48°2′÷5; (4)107°-52°32′30″. |
答案
(1)(
+7 9
-5 6
-3 4
)×(-36),7 18
=
×(-36)+7 9
×(-36)-5 6
×(-36)-3 4
×(-36),7 18
=-28-30+27+14,
=-17;
(2)(-2)2+[18-(-3)×2]÷2,
=4+(18+6)÷2,
=4+24÷2,
=4+12,
=16;
(3)48°2′÷5,
=(48×60′+2′)÷5,
=2882′÷5,
=572.4′,
=9°32′24″;
(4)107°-52°32′30″,
=106°59′60″-52°32′30″,
=54°27′30″.