1. 求下列各数的相反数:
(1)$\frac {4}{7}$; (2)0; (3)0.5;
(4)-2; (5)$-\frac {4}{3}$; (6)-5.1.
(1)$\frac {4}{7}$; (2)0; (3)0.5;
(4)-2; (5)$-\frac {4}{3}$; (6)-5.1.
答案:
1.
(1)$-\frac{4}{7}$
(2)0
(3)-0.5
(4)2
(5)$\frac{4}{3}$
(6)5.1
(1)$-\frac{4}{7}$
(2)0
(3)-0.5
(4)2
(5)$\frac{4}{3}$
(6)5.1
2. 化简下列各数:
(1)$-(-9)$; (2)$+(-7.08)$; (3)$+(+5)$;
(4)$-(+0.4)$; (5)$-[-(-10)]$; (6)$+[-(-\frac {2}{3})]$;
(7)$-[-(+66)]$; (8)$-\{ -[-(+3)]\}$.
(1)$-(-9)$; (2)$+(-7.08)$; (3)$+(+5)$;
(4)$-(+0.4)$; (5)$-[-(-10)]$; (6)$+[-(-\frac {2}{3})]$;
(7)$-[-(+66)]$; (8)$-\{ -[-(+3)]\}$.
答案:
2.
(1)9
(2)-7.08
(3)5
(4)-0.4
(5)-10
(6)$\frac{2}{3}$
(7)66
(8)-3
(1)9
(2)-7.08
(3)5
(4)-0.4
(5)-10
(6)$\frac{2}{3}$
(7)66
(8)-3
3. 求下列各数的相反数:
(1)$-(-1)$; (2)$-(+3.5)$; (3)$-(+2)$; (4)$+(-4)$;
(5)$-(-16)$; (6)$-(+25\frac {12}{13})$; (7)$+(-7.953)$; (8)$-[-(+\frac {9}{10})]$.
(1)$-(-1)$; (2)$-(+3.5)$; (3)$-(+2)$; (4)$+(-4)$;
(5)$-(-16)$; (6)$-(+25\frac {12}{13})$; (7)$+(-7.953)$; (8)$-[-(+\frac {9}{10})]$.
答案:
3.
(1)-1
(2)3.5
(3)2
(4)4
(5)-16
(6)$25\frac{12}{13}$
(7)7.953
(8)$-\frac{9}{10}$
(1)-1
(2)3.5
(3)2
(4)4
(5)-16
(6)$25\frac{12}{13}$
(7)7.953
(8)$-\frac{9}{10}$
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