一元一次方程:(1)、-5x=8 (2)5x+2=7x-10 (3)2+3(x-1)=5 (4)5(x-4)-3(2-x)=14 解下列方程:(1)10(x-1)=5;(2)7x?13-5x...
10-(8-5x)=7x+(3-3x)1\u3001x-(x-1)/2=2-(x-2)/3
x-x/2+1/2=2-x/3+2/3
x/2+x/3=2+2/3-1/2
5x/6=13/6
x=13/5
2\u3001(x-1)/2-(2x-7)/6=(4x-5)/3-1
x/2-1/2-x/3+7/6=4x/3-5/3-1
7/6-1/2+1+5/3=4x/3+x/3-x/2
10/3=7x/6
x=30/7
3\u30013(2x-1)=2(1-x)-1
6x-3=2-2x-1
8x=2-1+3
8x=4
x=1/2
4\u30011-(6-x)/6=0.4[1+(1+2x)/4]
1-(1-x/6)=0.4+0.1*(1+2x)
1-1+x/6=0.4+0.1+0.2x
x/6-0.2x=0.5
-x/30=0.5
x=-15
5\u300115-(8-5x)=7x+(4-3x)
15-8+5x=7x+4-3x
5x+3x-7x=4+8-15
x=-3
6\u3001(3x+1)/2-2=(3x-2)/10-(2x+3)/5
3x/2+1/2-2=3x/10-1/5-2x/5-3/5
3x/2-3x/10+2x/5=2-1/5-3/5-1/2
8x/5=7/10
x=7/16
7\u30017(2x-1)-3(4x-1)=4(3x+2)-1
14x-7-12x+3=12x+8-1
14x-12x-12x=8-1-3+7
-10x=11
x=-11/10
8\u30012(x-2)-3(4x-1)+9(1-x)
2x-4-12x+3=9-9x
2x-12x+9x=9-3+4
-x=10
x=-10
9\u3001y-(y-1)/2=2-(y+2)/5
y-y/2+1/2=2-y/5-2/5
y-y/2+y/5=2-2/5-1/2
7y/10=11/10
y=11/7
10\u3001(0.4x+0.9)/0.5-(0.03+0.02x)/0.03=(x-5)/2
4x/5+0.45-1-2x/3=x/2-5/2
4x/5-2x/3-x/2=1-5/2-0.45
-11x/30=-39/20
x=117/22
11\u30012x+(3x-1)=16-(x+1)
2x+3x-1=16-x-1
5x+x=15+1
6x=16
x=8/3
12\u3001(x-3)/2-(4x+1)/5=10
x/2-3/2-4x-1/5=10
-7x/2=10+1/5+3/2
-7x/2=117/10
x=-117/35
13\u3001(x-3)/0.5-(x+4)/0.2=1.6
2x-6-5x-20=1.6
-3x=27.6
x=-9.2
14\u3001[2(x+1)]/3={[5(x+1)]/6}-1
2x/3+2/3=5x/6+5/6-1
2x/3-5x/6=5/6-1-2/3
-x/6=-5/6
x=5
15\u3001(0.1x-02)/0.2-(x+1)/0.5+x
\u65e0\u7b49\u5f0f.
16\u3001(2x-1)/6-(5x+1)/8=1
x/3-1/6-5x/8-1/8=1
-7x/24=1+1/8+1/6
-7x/24=31/24
x=-31/7
17\u3001(3+x)/2-(2x+3)/3=(3x+11)/6
3/2+x/2-2x/3-1=x/2+11/6
-x/6-x/2=11/6-3/2+1
-2x/3=4/3
x=-2
18\u30015(x+2)=2(5x-1)
5x+10=10x-2
-5x=-12
x=12/5
19\u30017(2x-1)-3(4x-1)=4(3x+2)-1
14x-7-12x+3=12x+8-1
2x-4=12x+7
-10x=11
x=-11/10
20\u30013(x-7)+5(x-4)=15
3x-21+5x-20=15
8x-41=15
8x=56
x=7
\uff081\uff09\u53bb\u62ec\u53f7\uff0c\u5f9710x-10=5\uff0c\u79fb\u9879\uff0c\u5f9710x=15\uff0c\u7cfb\u6570\u5316\u4e3a1\uff0c\u5f97x=1.5\uff1b\uff082\uff09\u53bb\u5206\u6bcd\uff0c\u5f974\uff087x-1\uff09-6\uff085x+1\uff09=24-3\uff083x+2\uff09\uff0c\u53bb\u62ec\u53f7\uff0c\u5f9728x-4-30x-6=24-9x-6\uff0c\u79fb\u9879\uff0c\u5f9728x-30x+9x=24-6+6+4\uff0c\u5408\u5e76\u540c\u7c7b\u9879\uff0c\u5f977x=28\uff0c\u7cfb\u6570\u5316\u4e3a1\uff0c\u5f97x=4\uff1b\uff083\uff09\u53bb\u62ec\u53f7\uff0c\u5f972y+4-12y+3=9-9y\uff0c\u79fb\u9879\uff0c\u5f972y-12y+9y=9-3-4\uff0c\u5408\u5e76\u540c\u7c7b\u9879\uff0c\u5f97-y=2\uff0c\u7cfb\u6570\u5316\u4e3a1\uff0c\u5f97y=-2\uff1b\uff084\uff09\u53bb\u5206\u6bcd\uff0c\u5f97\uff080.8-9x\uff09-6\uff0813-3x\uff09=4\uff085x+1\uff09\uff0c\u53bb\u62ec\u53f7\uff0c\u5f970.8-9x-7.8+18x=20x+4\uff0c\u79fb\u9879\uff0c\u5f97-9x+18x-20x=4+7.8-0.8\uff0c\u5408\u5e76\u540c\u7c7b\u9879\uff0c\u5f97-11x=11\uff0c\u7cfb\u6570\u5316\u4e3a1\uff0c\u5f97x=-1\uff0e
(1) x=-8/5(2) )5x+2=7x-10 合并同类项,得2x=12 即 x=6
(3) 2+3(x-1)=5 去括号后合并同类项,得 3x=6 即 x=2
(4) 5(x-4)-3(2-x)=14 去括号后合并同类项,得 8x=40 即 x=5
(5) 1/6(3x-6)=2/5x-3 两边同乘30 ,去括号后合并同类项,得 3x=60 即 x=-20
(6)0.5x-0.7=6.5-1.3x 两边同乘10 ,合并同类项,得 8x=72 即 x=9
(7)7/4x-5=3/8 两边同乘8,合并同类项,得 14x=43 即 x=43/17
(8) y/2-5=1-(y+2)/5 两边同乘10 ,去括号后合并同类项,得 3y=56 即 y=56/3
(9) (2x-3):3=(3x-2):4 两边同乘12 ,去括号后合并同类项,得 x=30
(10) x/0.7-0.17/0.03-0.2x=1
10x/7-17/3-0.2x=1
两边同乘21,得 30x-119-4.2x=21
25.6x=98
x=3.83
-5x=8 x=-1.6
5x+2=7x-10 2x=12 x=6
2+3(x-1)=5 3x=5-2+3 3x=6 x=2
5(x-4)-3(2-x)=14 5x+3x=14+20+6 8x=40 x=5
0.5x-1=0.4x-3 0.1x=-2 x=-20
1.8x=7.2 x=4
7x/4-5=3/8 7x=4(5+3/8) 7x=20+3/2 7x=43/2 x=43/14
(y-5)/2=1-(y+2)/5 0.5y+0.2y=2.5+1-0.4 0.7y=3.1 y=31/7
4(2x-3)=3(3x-2) 8x-12=9x-8 x=-4
x/0.7-0.17/0.03 -0.2x=1 10x/7+0.2x=17/3 x(10/7+1/5)=17/3
x(50+7)/35 = 17/3 x=17*35/(57*3)=595/171
[1]x=8÷(-5) [2]2+10=7x-5x [3]2+3x-3=5
x=-8/5 12=2x 3x=5+3-2
x=6 x=2
额(1)x=-5分之8(2)x=6(3)x=2(4)x=5(5)x=-20(6)x=4(7)x=14分之73。发烧中请谅解。。。TT
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绛旓細瑙e緱:x=9/13,y=1/13 8.5*(1/3)+5*X=15*X x=1/6 9.(1/3)x/12=(1/3)x/[12*(5/4)]+1 鍖栫畝寰楋細(5/3)x=(4/3)x+60 (1/3)x=60 x=180 10.2X+5X=14000 7X=14000 X=2000 2X=4000 5X=10000 11. x+(35-20)*1.5%x=1323 x=1080 12 . 2x-10.3x=15 13 ....
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