giúp mình với Bài 1: Giải các phương trình sau :,$1/~x+5=0;$ $2/~3x-5=0;$ $3/~3=x-2$ $4/~7=x+4;$,$5/~2x=7+x;$ $6/~x-6=2x;$ $7/~3x+1=5x+2$ $8/~4x-3=2x+2;$,$9/~-2[x+3(x-1)]=4+x;$ $10/~-5[2x-2(x+1)]=6-x;$ $11/~\frac{3x}4=6$,$12/~\frac{2x}3=8;$ $13/~\frac35x=-12;$ $14/~\frac72x=-8;$ $15/~7+\frac{5x}3=x-2;$,$16/~x+4=\frac25x-3;$ $17/~1+\frac x9=\frac43;$ $18/~4+\frac x5=\frac53;$ $19/~\frac x5-\frac x2=9$,$20/~\frac x4=2-\frac x3;$ $21/~\frac{2x-1}5-\frac{x+1}2=0;$ $22/~\frac{2x}3-\frac{2x+5}6=\frac12;$ $23/~3=x-2$,$24/~7=x+4;$ $25/~2x-(3-5x)=4(x+3);$ $26/~5-(6-x)=4(3-2x);$,$27/~5(x-3)-4=2(x-1)+7$ $28/~5(x-3)-4=2(x-1)+7;$,$29/~4(3x-2)-3(x-4)=7x+20;$ $30/~\frac{8x-3}4-\frac{3x-2}2=\frac{2x-1}2+\frac{x+3}4;$

Question

Accepted Answer

Chắc chắn rồi, đây là phần giải chi tiết cho từng phương trình:

Bài 1:

x + 5 = 0

x = -5
3x - 5 = 0

3x = 5
x = 5/3
3 = x - 2

x = 3 + 2
x = 5
7 = x + 4

x = 7 - 4
x = 3
2x = 7 + x

2x - x = 7
x = 7
x - 6 = 2x

x - 2x = 6
-x = 6
x = -6
3x + 1 = 5x + 2

3x - 5x = 2 - 1
-2x = 1
x = -1/2
4x - 3 = 2x + 2

4x - 2x = 2 + 3
2x = 5
x = 5/2
-2[x + 3(x - 1)] = 4 + x

-2[x + 3x - 3] = 4 + x
-2[4x - 3] = 4 + x
-8x + 6 = 4 + x
-8x - x = 4 - 6
-9x = -2
x = 2/9
-5[2x - 2(x + 1)] = 6 - x

-5[2x - 2x - 2] = 6 - x
-5[-2] = 6 - x
10 = 6 - x
x = 6 - 10
x = -4
3x/4 = 6

3x = 24
x = 8
2x/3 = 8

2x = 24
x = 12
3/5x = -12

3 = -60x
x = -3/60 = -1/20
7/2x = -8

7 = -16x
x = -7/16
(7 + 5x)/3 = x - 2

7 + 5x = 3(x - 2)
7 + 5x = 3x - 6
5x - 3x = -6 - 7
2x = -13
x = -13/2
x + 4 = 2/5x - 3

5(x + 4) = 2x - 15
5x + 20 = 2x - 15
3x = -35
x = -35/3
(1 + x)/9 = 4/3

1 + x = 12
x = 11
(4 + x)/5 = 5/3

3(4 + x) = 25
12 + 3x = 25
3x = 13
x = 13/3
x/5 - x/2 = 9

2x - 5x = 90
-3x = 90
x = -30
x/4 = 2 - x/3

3x = 24 - 4x
7x = 24
x = 24/7
(2x - 1)/5 - (x + 1)/2 = 0

2(2x - 1) - 5(x + 1) = 0
4x - 2 - 5x - 5 = 0
-x - 7 = 0
x = -7
2x/3 - (2x + 5)/6 = 1/2

4x - (2x + 5) = 3
4x - 2x - 5 = 3
2x = 8
x = 4
3 = x - 2

x = 5
7 = x + 4

x = 3
2x - (3 - 5x) = 4(x + 3)

2x - 3 + 5x = 4x + 12
7x - 3 = 4x + 12
3x = 15
x = 5
5 - (6 - x) = 4(3 - 2x)

5 - 6 + x = 12 - 8x
x - 1 = 12 - 8x
9x = 13
x = 13/9
5(x - 3) - 4 = 2(x - 1) + 7

5x - 15 - 4 = 2x - 2 + 7
5x - 19 = 2x + 5
3x = 24
x = 8
5(x - 3) - 4 = 2(x - 1) + 7

x = 8 (giống câu 27)
4(3x - 2) - 3(x - 4) = 7x + 20

12x - 8 - 3x + 12 = 7x + 20
9x + 4 = 7x + 20
2x = 16
x = 8
8x - 3/4 - (3x - 2)/2 = (2x - 1)/2 + (x + 3)/4

8x - 3/4 - 3x/2 + 1 = x - 1/2 + x/4 + 3/4
32x - 3 - 6x + 4 = 4x - 2 + x + 3
26x + 1 = 5x + 1
21x = 0
x = 0