1. 解方程:
(1) $\frac{3}{2}x = 10 - 3\frac{1}{2}x$;
(2) $1 - 3(0.2 - x) = 5x$;
(3) $2(2x - 2) + 1 = 2x - (x - 3)$;
(4) $-\frac{5}{2}y + \frac{3}{2}y = -1 + 4$.
(1) $\frac{3}{2}x = 10 - 3\frac{1}{2}x$;
(2) $1 - 3(0.2 - x) = 5x$;
(3) $2(2x - 2) + 1 = 2x - (x - 3)$;
(4) $-\frac{5}{2}y + \frac{3}{2}y = -1 + 4$.
答案
(1) $x=2$
(2) $x=0.2$
(3) $x=2$
(4) $y=-3$
(2) $x=0.2$
(3) $x=2$
(4) $y=-3$
2. 解方程:
(1)$\frac{x-3}{2}-\frac{4x+1}{5}=1$;
(2)$\frac{2x-1}{3}=\frac{x+2}{4}-1$;
(3)$\frac{2x+1}{3}=1+\frac{10x+1}{6}$;
(4)$\frac{1}{3}(1-2x)=\frac{2}{7}(3x+1)$。
(1)$\frac{x-3}{2}-\frac{4x+1}{5}=1$;
(2)$\frac{2x-1}{3}=\frac{x+2}{4}-1$;
(3)$\frac{2x+1}{3}=1+\frac{10x+1}{6}$;
(4)$\frac{1}{3}(1-2x)=\frac{2}{7}(3x+1)$。
答案
(1) $x=-9$
(2) $x=-0.4$
(3) $x=-\frac{5}{6}$
(4) $x=\frac{1}{32}$
(2) $x=-0.4$
(3) $x=-\frac{5}{6}$
(4) $x=\frac{1}{32}$
3. 解方程:
(1) $2x - \frac{2}{3}(x + 3) = -x - (-3)$;
(2) $\frac{3 - 1.5x}{0.06} = \frac{1.5x}{0.04} + 20$.
(1) $2x - \frac{2}{3}(x + 3) = -x - (-3)$;
(2) $\frac{3 - 1.5x}{0.06} = \frac{1.5x}{0.04} + 20$.
答案
(1) $x=\frac{15}{7}$
(2) $x=0.48$
(2) $x=0.48$
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