1. 求下列各数的绝对值:
(1)$+5$;
(2)$-9$;
(3)$0$;
(4)$-0.5$;
(5)$\frac{5}{17}$;
(6)$-\frac{4}{7}$。
(1)$+5$;
(2)$-9$;
(3)$0$;
(4)$-0.5$;
(5)$\frac{5}{17}$;
(6)$-\frac{4}{7}$。
答案:(1)5
(2)9
(3)0
(4)0.5
(5)$\frac{5}{17}$
(6)$\frac{4}{7}$
(2)9
(3)0
(4)0.5
(5)$\frac{5}{17}$
(6)$\frac{4}{7}$
2. 计算:
(1) $|-12| + |18|$;
(2) $|-5.7| + |4.3|$;
(3) $|-2023| - |2022|$;
(4) $|2.375| - |1.275|$;
(5) $|-0.75| + \left| +\frac{1}{4} \right|$;
(6) $\left| -5\frac{1}{3} \right| + \left| -14\frac{2}{3} \right|$;
(7) $|+5| + |-2.9| - |0| - |-3.4|$;
(8) $|+5| + |-10| ÷ |-2|$;
(9) $\left| +\frac{1}{3} \right| + \left| -\frac{1}{6} \right| - \left| -\frac{1}{2} \right|$;
(10) $\left| -\frac{3}{4} \right| × \left| -\frac{4}{15} \right|$。
(1) $|-12| + |18|$;
(2) $|-5.7| + |4.3|$;
(3) $|-2023| - |2022|$;
(4) $|2.375| - |1.275|$;
(5) $|-0.75| + \left| +\frac{1}{4} \right|$;
(6) $\left| -5\frac{1}{3} \right| + \left| -14\frac{2}{3} \right|$;
(7) $|+5| + |-2.9| - |0| - |-3.4|$;
(8) $|+5| + |-10| ÷ |-2|$;
(9) $\left| +\frac{1}{3} \right| + \left| -\frac{1}{6} \right| - \left| -\frac{1}{2} \right|$;
(10) $\left| -\frac{3}{4} \right| × \left| -\frac{4}{15} \right|$。
答案:(1)30
(2)10
(3)1
(4)1.1
(5)1
(6)20
(7)4.5
(8)10
(9)0
(10)$\frac{1}{5}$
(2)10
(3)1
(4)1.1
(5)1
(6)20
(7)4.5
(8)10
(9)0
(10)$\frac{1}{5}$