初一数学上册解方程

1、(2x+1)/4+(x+1)/2=2
→ (2x+1)/4+(2x+2)/4=2
→ (4x+3)/4=2
→ 4x+3=8
→ 4x=5
→ x=5/4

2、(y+3)/3-(y+5)=(y+3)/3-(y-2)/2
→ y+5=(y-2)/2
→ 2y+10=y-2
→ y=-12

3、3x+(x-1)/2=3-(2x-1)/3
→ 18x+3x-3=18-4x+2
→ 25x=23
→ x=23/25

4、(2x+3)/2=(2x-1)/3
→ 6x+9=4x-2
→ 2x=-11
→ x=-11/2

5、-(x-3)/5=(3x+4)/15
→ -3x+9=3x+4
→ 6x=5
→ x=5/6

6、(3y-1)/4-1=(5x-7)/6
→ 9y-3-12=10y-14
→ y=-1

7、(6y+4)/3+(y-1)/4=2-(5y-5)/12
→ 24y+12+3y-3=24-5y+5
→ 32y=20
→ y=5/8

一元一次还是二元一次方程组

10x+11（700-x）=7300
10x+7700-11x=7300
-1x=7300-7700
-1x=-400
x=400

5x=4x＋15+9
5x-4x=15＋9
2.

1/5+1/20X+1/12X=1
8/60X=4/5
X=6

4X+3X+3X-2=53
10X=53+2
10X=55
X=5.5

1-1/5X=4(1-1/4)
1-1/5X=4-X
-1/5+X=4-1
4/5X=3
X