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

1. -5x=8   x=-1.6

2. 5x+2=7x-10    2x=12   x=6

3. 2+3(x-1)=5   3x=5-2+3   3x=6   x=2

4. 5(x-4)-3(2-x)=14    5x+3x=14+20+6    8x=40   x=5

5. 0.5x-1=0.4x-3    0.1x=-2    x=-20

6. 1.8x=7.2    x=4

7. 7x/4-5=3/8    7x=4(5+3/8)    7x=20+3/2   7x=43/2    x=43/14

8. (y-5)/2=1-(y+2)/5   0.5y+0.2y=2.5+1-0.4     0.7y=3.1   y=31/7

9. 4(2x-3)=3(3x-2)       8x-12=9x-8     x=-4

10. 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

涓鍏冧竴娆℃柟绋:(1)銆-5x=8 (2)5x+2=7x-10 (3)2+3(x-1)=5 (4)5(x-4...
绛旓細(1) x=-8/5 (2) )5x+2=7x-10 鍚堝苟鍚岀被椤癸紝寰2x=12 鍗 x=6 (3) 2+3(x-1)=5 鍘绘嫭鍙峰悗鍚堝苟鍚岀被椤癸紝寰 3x=6 鍗 x=2 (4) 5(x-4)-3(2-x)=14 鍘绘嫭鍙峰悗鍚堝苟鍚岀被椤癸紝寰 8x=40 鍗 x=5 (5) 1/6(3x-6)=2/5x-3 涓よ竟鍚屼箻30 ,鍘绘嫭鍙峰悗鍚堝苟鍚岀被椤癸紝寰 3x=60...

5x鍑1绛変簬璐涓x绛変簬鍑
绛旓細5x鍑1绛変簬璐涓锛x绛変簬0 瑙ｆ瀽锛5x-1=-1 瑙ｏ細绉婚」 5x=-1+1 5x=0 x=0

涓嬪垪鏂圭▼涓,涓鍏冧竴娆℃柟绋鐨勪釜鏁版槸( )?
绛旓細鈶1/x]-x=5锛屽垎姣嶄腑鍚湁鏈煡鏁帮紝涓嶆槸涓鍏冧竴娆℃柟绋嬶紝鏁呮湰閫夐」閿欒锛涒憿x2=3x锛屾湭鐭ユ暟鐨勬鏁版槸浜屾锛屼笉鏄竴鍏冧竴娆℃柟绋嬶紝鏁呮湰閫夐」閿欒锛涒懀2x-5=6锛岀鍚堜竴鍏冧竴娆℃柟绋嬬殑瀹氫箟锛屾晠鏈夐」姝ｇ‘锛涒懁x=1锛绗﹀悎涓鍏冧竴娆℃柟绋嬬殑瀹氫箟锛屾晠鏈夐」姝ｇ‘锛涙晠閫塁锛,1,涓嬪垪鏂圭▼涓紝涓鍏冧竴娆℃柟绋嬬殑涓暟鏄紙锛夆憼...

涓鍏冧竴娆℃柟绋寮忕殑瑙ｆ硶
绛旓細2.瑙涓鍏冧竴娆℃柟绋鐨勪竴鑸楠: (1)鏂圭▼鍚湁鍒嗘瘝鏃惰鍏堝幓鍒嗘瘝,浣胯繃绋嬬畝渚,鍏蜂綋鍋氭硶涓:鍦ㄦ柟绋嬬殑涓よ竟閮戒箻浠ュ悇鍒嗘瘝鐨勬渶灏忓叕鍊嶆暟銆傝娉ㄦ剰涓嶈婕忔帀涓嶅惈鍒嗘瘝鐨勯」,濡傛柟绋 x+ =3,鍘诲垎姣嶅緱10x+3=3灏遍敊浜,鍥犱负鏂圭▼鍙宠竟蹇樿涔樹互6,閫犳垚閿欒銆 (2)鍘绘嫭鍙:鎸夌収鍘绘嫭鍙锋硶鍒欏厛鍘诲皬鎷彿,鍐嶅幓涓嫭鍙,鏈鍚庡幓澶ф嫭鍙枫傜壒鍒...

鍒濅竴鏁板棰(瑙ｆ柟绋)銆涓鍏冧竴娆℃柟绋銆
绛旓細涓銆佸埄鐢ㄧЩ椤瑰強鍚堝苟鍚岀被椤规眰涓嬪垪鏂圭▼鐨勮В銆傦紙鍐欒繃绋嬶紝鍐欒繃绋嬶紒锛侊紒锛夛紙1锛3x+2=-5 3x=-5-2 3x=-7 x=-7/3 锛2锛2x-5=-7x+13 2x+7x=5+13 9x=18 x=2 锛3锛1/3x=1/4x-1 锛堜笁鍒嗕箣涓x=鍥涘垎涔嬩竴x-1锛1/3x-1/4x=-1 1/12x=-1 x=-12 锛4锛-6x-1=4 -6x=4+1 ...

-5x=-15瑙涓鍏冧竴娆℃柟绋杩囩▼?
绛旓細-5x=-15 瑙ｏ細-5x梅锛-5锛=锛-15锛壝凤紙-5锛墄=3

涓鍏冧竴娆℃柟绋涓鐧鹃亾(鍒濅竴鐨)
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 ....

甯垜鍒楀嚭10涓涓鍏冧竴娆℃柟绋 鍒濅腑绋嬪害鐨 骞舵眰瑙
绛旓細15-8+5x=7x+4-3x 7+5x=4x+4 x=-3 4. 3(x-7)-2[9-4(2-x)]=223x-21-2锛9-8+4x锛=22 3x-21-1-8x=22 -5x=44 x=-44/5 5. 2(x-2)+2=x+1 2x-4+2=x-1 2x-2=x-1 x=1 6. (x-6)5=2x 5x-30=2x 3x=30 x=10 7. 3x+x=18-2x 6x=18 x=3 8. 30x...

璇峰府蹇欑畻涓涓涓鍏冧竴娆℃柟绋
绛旓細绛旀:涓斿彧鏈変竴,涓,涓 7.38掳12鈥=___掳,67.5掳=___掳___鈥. 绛旀:38.2,67,30 8.濡傛灉 x2-3x=1鏄叧浜巟鐨涓鍏冧竴娆℃柟绋,鍒檃=___. 绛旀: 浜屻侀夋嫨棰:(姣忓皬棰3鍒,鍏24鍒) 9.涓嬪垪璇存硶涓,姝ｇ‘鐨勬槸 A.|a|涓嶆槸璐熸暟 B.-a鏄礋鏁 C.-(-a)涓瀹氭槸姝ｆ暟 D. 涓嶆槸鏁存暟 绛旀:A. 10.骞抽潰涓婃湁浠绘剰...

涓鍏冧竴娆℃柟绋5x=1.5鐨勮В鏄粈涔?
绛旓細5x=1.5 瑙ｏ細5x梅5=1.5梅5 x=0.3 妫楠岋細鎶妜=0.3浠ｅ叆鏂圭▼鐨勫乏杈广傛柟绋嬬殑宸﹁竟=5脳0.3 =1.5 =鏂圭▼鍙宠竟 鏂圭▼宸﹁竟=鏂圭▼鍙宠竟 鎵浠ワ紝x=0.3鏄柟绋嬬殑瑙ｃ

扩展阅读：初一数学一元一次视频 ... 一元一次方程教学视频 ... 一元二次方程题 ... 初中一元一次方程题目 ... 一元一次计算题及答案 ... 二元一次例题20道 ... 初一一元一次方程50道 ... 一元一次方程组100道 ... 一元一次解答题100道 ...