1. 方程$-2x+3= 5$的解为______.
答案
x=-1
解析
解:$-2x + 3 = 5$
$-2x = 5 - 3$
$-2x = 2$
$x = -1$
$-2x = 5 - 3$
$-2x = 2$
$x = -1$
2. 方程$3x-3= 6$的解为______.
答案
x=3
解析
解:$3x - 3 = 6$
$3x = 6 + 3$
$3x = 9$
$x = 3$
$3x = 6 + 3$
$3x = 9$
$x = 3$
3. 方程$-4x+3= -5$的解为______.
答案
x=2
解析
解:$-4x+3=-5$
$-4x=-5-3$
$-4x=-8$
$x=2$
$-4x=-5-3$
$-4x=-8$
$x=2$
4. 方程$-0.3x+3= -6$的解为______.
答案
x=30
解析
解:$-0.3x + 3 = -6$
$-0.3x = -6 - 3$
$-0.3x = -9$
$x = \frac{-9}{-0.3}$
$x = 30$
$-0.3x = -6 - 3$
$-0.3x = -9$
$x = \frac{-9}{-0.3}$
$x = 30$
5. 方程$\frac {1}{2}x-1= -\frac {7}{2}$的解为______.
答案
x=-5
解析
解:$\frac{1}{2}x - 1 = -\frac{7}{2}$
$\frac{1}{2}x = -\frac{7}{2} + 1$
$\frac{1}{2}x = -\frac{5}{2}$
$x = -5$
$\frac{1}{2}x = -\frac{7}{2} + 1$
$\frac{1}{2}x = -\frac{5}{2}$
$x = -5$
6. 方程$-\frac {1}{3}x+5= -\frac {4}{3}$的解为______.
答案
x=19
解析
解:$-\frac{1}{3}x + 5 = -\frac{4}{3}$
$-\frac{1}{3}x = -\frac{4}{3} - 5$
$-\frac{1}{3}x = -\frac{4}{3} - \frac{15}{3}$
$-\frac{1}{3}x = -\frac{19}{3}$
$x = 19$
$-\frac{1}{3}x = -\frac{4}{3} - 5$
$-\frac{1}{3}x = -\frac{4}{3} - \frac{15}{3}$
$-\frac{1}{3}x = -\frac{19}{3}$
$x = 19$
7. $2x= 3x-5$
答案
x=5
解析
解:$2x - 3x = -5$
$-x = -5$
$x = 5$
$-x = -5$
$x = 5$
8. $-2x-2= 3x$
答案
x=-$\frac{2}{5}$
解析
解:$-2x-3x=2$
$-5x=2$
$x=-\frac{2}{5}$
$-5x=2$
$x=-\frac{2}{5}$
9. $8x-2= 5x+2$
答案
x=$\frac{4}{3}$
解析
解:8x - 5x = 2 + 2
3x = 4
x = $\frac{4}{3}$
3x = 4
x = $\frac{4}{3}$
10. $10x-2= 4-2x$
答案
x=$\frac{1}{2}$
解析
解:$10x + 2x = 4 + 2$
$12x = 6$
$x = \frac{6}{12}$
$x = \frac{1}{2}$
$12x = 6$
$x = \frac{6}{12}$
$x = \frac{1}{2}$
11. $22x-0.3= 1.2+23x$
答案
x=-1.5
解析
解:$22x - 23x = 1.2 + 0.3$
$-x = 1.5$
$x = -1.5$
$-x = 1.5$
$x = -1.5$
12. $0.1x+4= x-5$
答案
x=10
解析
解:$0.1x + 4 = x - 5$
$4 + 5 = x - 0.1x$
$9 = 0.9x$
$x = 10$
$4 + 5 = x - 0.1x$
$9 = 0.9x$
$x = 10$
13. $\frac {1}{3}x-1= 5-x$
答案
x=$\frac{9}{2}$
解析
解:$\frac{1}{3}x - 1 = 5 - x$
$\frac{1}{3}x + x = 5 + 1$
$\frac{4}{3}x = 6$
$x = 6 × \frac{3}{4}$
$x = \frac{9}{2}$
$\frac{1}{3}x + x = 5 + 1$
$\frac{4}{3}x = 6$
$x = 6 × \frac{3}{4}$
$x = \frac{9}{2}$
14. $3x-7+6x= 4x-8$
答案
x=-$\frac{1}{5}$
解析
解:$3x-7+6x=4x-8$
$9x-7=4x-8$
$9x-4x=-8+7$
$5x=-1$
$x=-\dfrac{1}{5}$
$9x-7=4x-8$
$9x-4x=-8+7$
$5x=-1$
$x=-\dfrac{1}{5}$
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