3.初中一年级数学（详细为佳，选两位的为满意回答)”
- 提问者网友：富士山上尢
- 2021-04-13 08:33
- 五星知识达人网友：千杯敬自由
- 2021-04-13 09:33
(1) 解：(2/11)x=(3/4)-3
(2/5)x=-3/5
x=-2/3
(2) 解：0.5x+1.3x=6.5+0.7
1.8x=7.2
x=4
(3)解：(1/2)x-1=(2/5)x-3
(1/2)x-(2/5)x=-3+1
(1/10)x=-2
x=-20
(4)解：1-2x=3x+1-9
5x=9
x=9/5
(5)解：x-[x-(x-1)/3]=7-[(x+3)/5]
15x-5(x-1)=105-3(x+3)
15x-5x+5=105-3x-9
13x=91
x=7
答：当x=7时，两式的值相等。
- 1楼网友：上分大魔王
- 2021-04-13 13:20
- 2楼网友：冷風如刀
- 2021-04-13 12:17
4/3-3x=3-(11/2)x
8-18x=18-33x
15x= -10
x= -2/3
0.5x-0.7=6.5-1.3x
5x-7=65-13x
5x+13x=65+7
18x=72
x=3
1/6(3x-6)=(2/5)x-3
5(3x-6)=12x-90
15x-30=12x-90
15x-12x=30-90
3x= -60
x= -20
(1-2x)/3=(3x+1)/3-3
1-2x=3x+1-9
5x=9
x=9/5
x-(x-1)/3=7-(x+3)/5
15x-5(x-1)=105-3(x+3)
15x-5x+5=105-3x-9
13x=91
x=7
当x=7时x-(x-1)/3与7-(x+3)/5的值相等
- 3楼网友：鱼忧
- 2021-04-13 11:42
4/3-8x=3-11/2x -8x+11/2x=3-4/3 -5/2x=5/3 x=-2/3
剩下的自己做
- 4楼网友：神的生死簿
- 2021-04-13 10:58
1.11/2 x-8x=3-4/3
11/2 x-16/2 x=9/3 -4/3
-5/2 x=5/3
x=-2/3
2.0.5x+1.3x=6.5+0.7
1.8x=7.2
x=4
3.1/2 x-1=2/5 x-3
2/5 x-1/2 x=3-1
-1/10 x=2
x=-20
4.(3x+1)/3-(1-2x)/3=3
(3x+1-1+2x)/3=3
5x=9
x=9/5
5.x-(x-1)/3=7-(x+3)/5
15x-5(x-1)=105-3(x+3)
15x-5x+5=105-3x-9
13x=91
x=7