3. 解下列方程:
(1) $2(10 - 0.5y) = -(1.5y + 2)$;
(2) $\frac{1}{3}(x - 5) = 3 - \frac{2}{3}(x - 5)$;
(3) $\frac{x + 2}{4} - 1 = \frac{3 - 2x}{6}$;
(4) $x - \frac{1}{9}(x - 9) = \frac{1}{3}[x + \frac{1}{3}(x - 9)]$;
(5) $\frac{2x - 1}{0.5} - \frac{x + 3}{0.6} = 0.5x + 2$;
(6) $x - 7 = 10 - 4(x + 0.5)$。
(1) $2(10 - 0.5y) = -(1.5y + 2)$;
(2) $\frac{1}{3}(x - 5) = 3 - \frac{2}{3}(x - 5)$;
(3) $\frac{x + 2}{4} - 1 = \frac{3 - 2x}{6}$;
(4) $x - \frac{1}{9}(x - 9) = \frac{1}{3}[x + \frac{1}{3}(x - 9)]$;
(5) $\frac{2x - 1}{0.5} - \frac{x + 3}{0.6} = 0.5x + 2$;
(6) $x - 7 = 10 - 4(x + 0.5)$。
答案
(1) $y = -44$
(2) $x = 8$
(3) $x= \frac{12}{7}$
(4) $x= -\frac{9}{2}$
(5) $x= \frac{54}{11}$
(6) $x=3$
(2) $x = 8$
(3) $x= \frac{12}{7}$
(4) $x= -\frac{9}{2}$
(5) $x= \frac{54}{11}$
(6) $x=3$
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