1. 口算：
(1)$(-3)-(-5)=$
(2)$0-7=$
(3)$|-1|-3=$
(4)$6-9=$
(5)$(+4)-(-7)=$
(6)$0-(-5)=$
(7)$-2.5-5.9=$
(8)$1.9-(-0.6)=$
(9)$2-8=$
(10)$-3-6=$
(11)$(-8)-8=$
(12)$8-(-8)=$
(13)$8-8=$
(14)$16-47=$
(15)$28-(-14)=$
(16)$(-3.8)-(+7)=$
(17)$(-\dfrac{2}{5})-(-\dfrac{3}{5})=$
(18)$\dfrac{1}{2}-\dfrac{1}{3}=$
(19)$(-\dfrac{1}{2})-\dfrac{1}{3}=$
(20)$0-(-\dfrac{3}{4})=$
(21)$(-2)-(+\dfrac{2}{3})=$
(22)$-\dfrac{1}{3}-\dfrac{1}{4}=$
(23)$15.9-(-8.1)=$
(24)$-17.3-(-5)=$
(1)$(-3)-(-5)=$
2
;(2)$0-7=$
-7
;(3)$|-1|-3=$
-2
;(4)$6-9=$
-3
;(5)$(+4)-(-7)=$
11
;(6)$0-(-5)=$
5
;(7)$-2.5-5.9=$
-8.4
;(8)$1.9-(-0.6)=$
2.5
;(9)$2-8=$
-6
;(10)$-3-6=$
-9
;(11)$(-8)-8=$
-16
;(12)$8-(-8)=$
16
;(13)$8-8=$
0
;(14)$16-47=$
-31
;(15)$28-(-14)=$
42
;(16)$(-3.8)-(+7)=$
-10.8
;(17)$(-\dfrac{2}{5})-(-\dfrac{3}{5})=$
$\dfrac{1}{5}$
;(18)$\dfrac{1}{2}-\dfrac{1}{3}=$
$\dfrac{1}{6}$
;(19)$(-\dfrac{1}{2})-\dfrac{1}{3}=$
$-\dfrac{5}{6}$
;(20)$0-(-\dfrac{3}{4})=$
$\dfrac{3}{4}$
;(21)$(-2)-(+\dfrac{2}{3})=$
$-2\dfrac{2}{3}$
;(22)$-\dfrac{1}{3}-\dfrac{1}{4}=$
$-\dfrac{7}{12}$
;(23)$15.9-(-8.1)=$
24
;(24)$-17.3-(-5)=$
-12.3
.答案：1.(1)2 (2)-7 (3)-2 (4)-3 (5)11 (6)5 (7)-8.4 (8)2.5 (9)-6 (10)-9 (11)-16 (12)16 (13)0 (14)-31 (15)42 (16)-10.8 (17)$\dfrac{1}{5}$ (18)$\dfrac{1}{6}$ (19)$-\dfrac{5}{6}$ (20)$\dfrac{3}{4}$ (21)$-2\dfrac{2}{3}$ (22)$-\dfrac{7}{12}$ (23)24 (24)-12.3
2. 计算：
(1)$-13 - | -7 |$；
(2)$3\frac{1}{4} - 0.75$；
(3)$3\frac{7}{12} - \frac{3}{4}$；
(4)$10\frac{1}{3} - \frac{26}{5}$；
(5)$(-\frac{1}{2}) - (-1\frac{1}{3})$；
(6)$(-2\frac{7}{10}) - (-3\frac{3}{5})$。
(1)$-13 - | -7 |$；
(2)$3\frac{1}{4} - 0.75$；
(3)$3\frac{7}{12} - \frac{3}{4}$；
(4)$10\frac{1}{3} - \frac{26}{5}$；
(5)$(-\frac{1}{2}) - (-1\frac{1}{3})$；
(6)$(-2\frac{7}{10}) - (-3\frac{3}{5})$。
答案：2.(1)-20 (2)$\dfrac{5}{2}$ (3)$\dfrac{17}{6}$ (4)$\dfrac{77}{15}$ (5)$\dfrac{5}{6}$ (6)$\dfrac{9}{10}$