解方程:
(1)$2x - 1 = 3$; (2)$- \frac{1}{3}x - 5 = 4$; (3)$5x + 1 = 9$;
(4)$2x + 1 = 7$; (5)$- \frac{1}{2}x - 2 = 6$; (6)$- \frac{2}{3}x + 3 = - 15$;
(7)$\frac{5}{6} - x = \frac{1}{2}$; (8)$x - \frac{1}{2} = \frac{3}{8}$; (9)$\frac{3}{5} + 2x = \frac{9}{10}$;
(10)$4x - 3 = - 4$.
(1)$2x - 1 = 3$; (2)$- \frac{1}{3}x - 5 = 4$; (3)$5x + 1 = 9$;
(4)$2x + 1 = 7$; (5)$- \frac{1}{2}x - 2 = 6$; (6)$- \frac{2}{3}x + 3 = - 15$;
(7)$\frac{5}{6} - x = \frac{1}{2}$; (8)$x - \frac{1}{2} = \frac{3}{8}$; (9)$\frac{3}{5} + 2x = \frac{9}{10}$;
(10)$4x - 3 = - 4$.
答案:(1)x=2 (2)x=-27 (3)x=1.6 (4)x=3 (5)x=-16 (6)x=27 (7)x=$\frac{1}{3}$ (8)x=$\frac{7}{8}$ (9)x=$\frac{3}{20}$ (10)x=-$\frac{1}{4}$
解析:
(1)解:$2x=3+1$
$2x=4$
$x=2$
(2)解:$-\frac{1}{3}x=4+5$
$-\frac{1}{3}x=9$
$x=9×(-3)$
$x=-27$
(3)解:$5x=9-1$
$5x=8$
$x=\frac{8}{5}=1.6$
(4)解:$2x=7-1$
$2x=6$
$x=3$
(5)解:$-\frac{1}{2}x=6+2$
$-\frac{1}{2}x=8$
$x=8×(-2)$
$x=-16$
(6)解:$-\frac{2}{3}x=-15-3$
$-\frac{2}{3}x=-18$
$x=-18×(-\frac{3}{2})$
$x=27$
(7)解:$-x=\frac{1}{2}-\frac{5}{6}$
$-x=\frac{3}{6}-\frac{5}{6}$
$-x=-\frac{2}{6}=-\frac{1}{3}$
$x=\frac{1}{3}$
(8)解:$x=\frac{3}{8}+\frac{1}{2}$
$x=\frac{3}{8}+\frac{4}{8}$
$x=\frac{7}{8}$
(9)解:$2x=\frac{9}{10}-\frac{3}{5}$
$2x=\frac{9}{10}-\frac{6}{10}$
$2x=\frac{3}{10}$
$x=\frac{3}{10}×\frac{1}{2}$
$x=\frac{3}{20}$
(10)解:$4x=-4+3$
$4x=-1$
$x=-\frac{1}{4}$
$2x=4$
$x=2$
(2)解:$-\frac{1}{3}x=4+5$
$-\frac{1}{3}x=9$
$x=9×(-3)$
$x=-27$
(3)解:$5x=9-1$
$5x=8$
$x=\frac{8}{5}=1.6$
(4)解:$2x=7-1$
$2x=6$
$x=3$
(5)解:$-\frac{1}{2}x=6+2$
$-\frac{1}{2}x=8$
$x=8×(-2)$
$x=-16$
(6)解:$-\frac{2}{3}x=-15-3$
$-\frac{2}{3}x=-18$
$x=-18×(-\frac{3}{2})$
$x=27$
(7)解:$-x=\frac{1}{2}-\frac{5}{6}$
$-x=\frac{3}{6}-\frac{5}{6}$
$-x=-\frac{2}{6}=-\frac{1}{3}$
$x=\frac{1}{3}$
(8)解:$x=\frac{3}{8}+\frac{1}{2}$
$x=\frac{3}{8}+\frac{4}{8}$
$x=\frac{7}{8}$
(9)解:$2x=\frac{9}{10}-\frac{3}{5}$
$2x=\frac{9}{10}-\frac{6}{10}$
$2x=\frac{3}{10}$
$x=\frac{3}{10}×\frac{1}{2}$
$x=\frac{3}{20}$
(10)解:$4x=-4+3$
$4x=-1$
$x=-\frac{1}{4}$