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1. 口算:
(1)$(-3)-(-5)=$
(3)$6-9=$
(5)$(-5)-(-8)=$
(7)$|-1.5|-(-2.5)=$
(9)$|-8|-8=$
(11)$28-(-14)=$
(13)$(-\frac {2}{5})-(-\frac {3}{5})=$
(15)$0-(-\frac {3}{4})=$
(1)$(-3)-(-5)=$
2
(2)$0-7=$-7
(3)$6-9=$
-3
(4)$(+4)-(-7)=$11
(5)$(-5)-(-8)=$
3
(6)$0-(-5)=$5
(7)$|-1.5|-(-2.5)=$
4
(8)$-3-6=$-9
(9)$|-8|-8=$
0
(10)$0-6=$-6
(11)$28-(-14)=$
42
(12)$(-3.8)-(+7)=$-10.8
(13)$(-\frac {2}{5})-(-\frac {3}{5})=$
$\frac{1}{5}$
(14)$\frac {1}{2}-\frac {1}{3}=$$\frac{1}{6}$
(15)$0-(-\frac {3}{4})=$
$\frac{3}{4}$
(16)$(-2)-(+\frac {2}{3})=$$-2\frac{2}{3}$
答案：
(1)2
(2)-7
(3)-3
(4)11
(5)3
(6)5
(7)4
(8)-9
(9)0
(10)-6
(11)42
(12)-10.8
(13)$\frac{1}{5}$
(14)$\frac{1}{6}$
(15)$\frac{3}{4}$
(16)$-2\frac{2}{3}$
(1)2
(2)-7
(3)-3
(4)11
(5)3
(6)5
(7)4
(8)-9
(9)0
(10)-6
(11)42
(12)-10.8
(13)$\frac{1}{5}$
(14)$\frac{1}{6}$
(15)$\frac{3}{4}$
(16)$-2\frac{2}{3}$
2. 计算:
(1)$-13-|-7|;$ (2)$3\frac {1}{4}-0.75;$
(3)$3\frac {7}{12}-\frac {3}{4};$ (4)$(-\frac {1}{2})-(-1\frac {1}{3}).$
(1)$-13-|-7|;$ (2)$3\frac {1}{4}-0.75;$
(3)$3\frac {7}{12}-\frac {3}{4};$ (4)$(-\frac {1}{2})-(-1\frac {1}{3}).$
答案：
(1)-20
(2)2.5
(3)$2\frac{5}{6}$
(4)$\frac{5}{6}$
(1)-20
(2)2.5
(3)$2\frac{5}{6}$
(4)$\frac{5}{6}$
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