C1.10x2=6x+8
C2.23x+10=23+13x
C3.9x-6=4x+1
C4.15x-12=11x+15
C5.21x+9=19-11x
C6.15+16x=8-3x
C7.19-4x=8x+23
C8.51-10x=3x-21
C9.8-6x=11-4x
C10.2(3x+4)-3(1-2x)=8x+10
C11.5(3-4x)-4(2x-5)=9-10x
C12.3(5x-6)-2(2x-5)=11x-10
C13.10x+5(3x-2)=25-10x
C14.6(2x-3)+3(3-5x)=8x-9
C15.3(4x-2)+2(6-2x)=10-6x
C16.5(3-6x)-4(2-2x)=4x-9
B2:tìm cặp số nguyên x, y thỏa mãn
X y+2x+y=0
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Bài 1:
16:
=>15-30x-8+8x=4x-9
=>-22x+7=4x-9
=>-26x=-16
=>x=8/13
15: \(\Leftrightarrow12x-6+12-4x=10-6x\)
=>8x+6=10-6x
=>14x=4
=>x=2/7
14: \(\Leftrightarrow12x-18+9-15x=8x-9\)
=>-3x-9=8x-9
=>x=0
13: \(\Leftrightarrow10x+15x-10=25-10x\)
=>25x-10=25-10x
=>35x=35
=>x=1
12: \(\Leftrightarrow15x-18-4x+10=11x-10\)
=>11x-8=11x-10(loại)
C1= 10 x 2 = 6x+8
6x + 8 = 20
6x = 20 -8
6x = 12
x =12 : 6
x = 2
C2: 23x + 10 = 23 + 13x
23x - 13x = 23 - 10
10x =13
x = 13 : 10
x = 1,3
C3= 9x - 6 = 4x + 1
9x - 4x = 1+ 6
5x = 7
x = 7 : 5
x=1,4
C4, 15x - 12 = 11x + 15
15x - 11x = 15 + 12
4x = 27
x= \(\dfrac{27}{4}\)
C5; 21x + 9 = 19 - 11x
21x + 11x = 19 - 9
32x = 10
x = 10 : 32
x = \(\dfrac{5}{16}\)
C6 ,15 + 16x = 8 - 3x
16x + 3x = 8 - 15
19x = -7
x= -7 : 19
x= \(-\dfrac{7}{19}\)
C7,
29 - 4x = 8x + 23
-4x - 8x = 29 - 23
-12x = 6
x = 6 : (-12)
x= -0,5
C8)51 - 10x = 3x - 21
-10x - 3x = 51 + 21
-13x = 72
x = 72 : (-13)
x = \(-\dfrac{72}{13}\)