问题 解答题
计算
(1)(
7
9
+
5
6
-
3
4
-
7
18
)×(-36);(2)(-2)2+[18-(-3)×2]÷2;
(3)48°2′÷5; (4)107°-52°32′30″.
答案

(1)(

7
9
+
5
6
-
3
4
-
7
18
)×(-36),

=

7
9
×(-36)+
5
6
×(-36)-
3
4
×(-36)-
7
18
×(-36),

=-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″.

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