1. 写出下列各数的相反数:
(1)5; (2)$\frac {4}{7}$; (3)0; (4)0.5;
(5)$-2$; (6)$-\frac {4}{3}$; (7)$-5.1$; (8)$-1\frac {2}{3}$.
(1)5; (2)$\frac {4}{7}$; (3)0; (4)0.5;
(5)$-2$; (6)$-\frac {4}{3}$; (7)$-5.1$; (8)$-1\frac {2}{3}$.
答案:
1.
(1)-5
(2)$-\frac{4}{7}$
(3)0
(4)-0.5
(5)2
(6)$\frac{4}{3}$
(7)5.1
(8)$1\frac{2}{3}$
(1)-5
(2)$-\frac{4}{7}$
(3)0
(4)-0.5
(5)2
(6)$\frac{4}{3}$
(7)5.1
(8)$1\frac{2}{3}$
2. 化简下列各数:
(1)$-(-9)$; (2)$+(-7.08)$;
(3)$-(+18)$; (4)$+(+5)$;
(5)$-(-\frac {2}{5})$; (6)$-(+0.4)$;
(7)$-[-(-10)]$; (8)$+[-(-\frac {2}{3})]$;
(9)$-[-(+66)]$; (10)$-\{ +[-(-\frac {2}{5})]\}$.
(1)$-(-9)$; (2)$+(-7.08)$;
(3)$-(+18)$; (4)$+(+5)$;
(5)$-(-\frac {2}{5})$; (6)$-(+0.4)$;
(7)$-[-(-10)]$; (8)$+[-(-\frac {2}{3})]$;
(9)$-[-(+66)]$; (10)$-\{ +[-(-\frac {2}{5})]\}$.
答案:
2.
(1)9
(2)-7.08
(3)-18
(4)5
(5)$\frac{2}{5}$
(6)-0.4
(7)-10
(8)$\frac{2}{3}$
(9)66
(10)$-\frac{2}{5}$
(1)9
(2)-7.08
(3)-18
(4)5
(5)$\frac{2}{5}$
(6)-0.4
(7)-10
(8)$\frac{2}{3}$
(9)66
(10)$-\frac{2}{5}$
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