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a) \(3x-10=2x+13\Leftrightarrow x=13+10=23\)

b) \(x+12=-5-x\Leftrightarrow2x=-17\Leftrightarrow x=-\frac{17}{2}\)

c) \(x+5=10-x\Leftrightarrow2x=5\Leftrightarrow x=\frac{5}{2}\)

d) \(6x+23=2x-12\Leftrightarrow4x=-35\Leftrightarrow x=-\frac{35}{4}\)

e) \(12-x=x+1\Leftrightarrow2x=11\Leftrightarrow x=\frac{11}{2}\)

f) \(14+4x=3x+20\Leftrightarrow x=20-14=6\)

g) \(2\left(x-1\right)+3\left(x-2\right)=x-4\Leftrightarrow2x-2+3x-6=x-4\)

\(\Leftrightarrow5x-8=x-4\Leftrightarrow4x=4\Leftrightarrow x=1\)

h ) \(3\left(4-x\right)-2\left(x-1\right)=x+20\Leftrightarrow12-3x-2x+2=x+20\)

\(\Leftrightarrow14-5x=x+20\Leftrightarrow6x=-6\Leftrightarrow x=-1\)

i ) \(4\left(2x+7\right)-3\left(3x-2\right)=24\Leftrightarrow8x+28-9x+6=24\)

\(\Leftrightarrow34-x=24\Leftrightarrow x=34-24=10\)

k) \(3\left(x-2\right)+2x=10\Leftrightarrow3x-6+2x=5x-6=10\)

\(\Leftrightarrow5x=10+6=16\Leftrightarrow x=\frac{16}{5}\)

Tự KL cho các phần

Dạng 3 :

a) 3x - 10 = 2x + 13

=> 3x - 2x = 13 - 10

=> x = 3

b) x + 12 = -5 - x

=> x + x = -5 - 12

=> 2x = -17

=> x = -8,5

c) x + 5 = 10 - x 

=> x + x = 10 - 5

=> 2x = 5

=> x = 2,5

d) 6x + 23 = 2x - 12

=> 2x - 6x = 23 + 12

=> -4x = 35

=> x = -8,75

e) 12 - x = x + 1

=> x + x = 12 - 1

=> 2x = 11

=> x = 5,5

f) 14 + 4x = 3x + 20

=> 4x - 3x = 20 - 14

=> x = 6

26 tháng 3 2020

a,3x-10=2x+13

\(\Rightarrow\)3x-2x=10+13

\(\Rightarrow\)x=23

b,x+12=-5-x

\(\Rightarrow\)x+x=-12-5

\(\Rightarrow\)2x=-17

\(\Rightarrow\)x=-8,5

c,x+5=10-x

\(\Rightarrow\)x+x=-5+10

\(\Rightarrow\)2x=5

\(\Rightarrow\)x=2,5

e,12-x=x+1

\(\Rightarrow\)-x-x=-12+1

\(\Rightarrow\)-2x=-11

\(\Rightarrow\)x=5,5

f,14+4x=3x+20

\(\Rightarrow\)4x-3x=-14+20

\(\Rightarrow\)x=6

g,2.(x-1)+3(x-2)=x-4

\(\Rightarrow\)2x-2+3x-6=x-4

\(\Rightarrow\)2x-2+3x-6-x+4=0

\(\Rightarrow\)4x-4=0

\(\Rightarrow\)4x=4

\(\Rightarrow\)x=1

h,3(4-x)-2(x-1)=x+20

\(\Rightarrow\)12-3x-2x+2-x-20=0

\(\Rightarrow\)-6x-6=0

\(\Rightarrow\)-6x=6

\(\Rightarrow\)x=-1

i,4(2x+7)-3(3x-2)=24

\(\Rightarrow\)8x+28-9x+6=24

\(\Rightarrow\)-x+34=24

\(\Rightarrow\)-x=-10

\(\Rightarrow\)x=10

k,3(x-2)+2x=10

\(\Rightarrow\)3x-6+2x=10

\(\Rightarrow\)5x-6=10

\(\Rightarrow\)5x=16

\(\Rightarrow\)x=3,2

Phần d, tớ không biết làm!!!!

26 tháng 3 2020

Nhưng bn cũng đã giúp tớ rùi . Thank kiu bạn

28 tháng 3 2020

a. 3x-10=2x+13

    3x-2x=13+10

            x=23

28 tháng 3 2020

a) \(3x-10=2x+13\)

\(\Leftrightarrow3x-2x=13+10\)

\(\Leftrightarrow x=23\)

b) \(x+12=-5-x\)

\(\Leftrightarrow x+x=-5-12\)

\(\Leftrightarrow2x=-17\)

\(\Leftrightarrow x=-\frac{17}{2}\)

c) \(x+5=10-x\)

\(\Leftrightarrow x+x=10-5\)

\(\Leftrightarrow2x=5\)

\(\Leftrightarrow x=\frac{5}{2}\)

d) \(6x+2^3=2x-12\)

\(\Leftrightarrow6x+8=2x-12\)

\(\Leftrightarrow6x-2x=-12-8\)

\(\Leftrightarrow4x=-20\)

\(\Leftrightarrow x=-5\)

e) \(12-x=x+1\)

\(\Leftrightarrow-x-x=1-12\)

\(\Leftrightarrow-2x=-11\)

\(\Leftrightarrow x=\frac{11}{2}\)

g) \(2\left(x-1\right)+3\left(x-2\right)=x-4\)

\(\Leftrightarrow2x-2+3x-6=x-4\)

\(\Leftrightarrow2x+3x-x=-4+6+2\)

\(\Leftrightarrow4x=4\)

\(\Leftrightarrow x=1\)

h) \(14+4x=3x+20\)

\(\Leftrightarrow4x-3x=20-14\)

\(\Leftrightarrow x=6\)

i) \(4\left(2x+7\right)-3\left(3x-2\right)=24\)

\(\Leftrightarrow8x+28-9x+6=24\)

\(\Leftrightarrow8x-9x=24-6-28\)

\(\Leftrightarrow-x=-10\)

\(\Leftrightarrow x=10\)

k) \(3\left(4-x\right)-2\left(x-1\right)=x+20\)

\(\Leftrightarrow12-3x-2x+2=x+20\)

\(\Leftrightarrow-3x-2x-x=20-2-12\)

\(\Leftrightarrow-6x=6\)

\(x=-1\)

l) \(3\left(x-2\right)+2x=10\)

\(\Leftrightarrow3x-6+2x=10\)

\(\Leftrightarrow3x+2x=10+6\)

\(\Leftrightarrow5x=16\)

\(\Leftrightarrow x=\frac{16}{5}\)

Lần sau bạn chỉ nên đăng ít câu hỏi một thôi nhé, đăng nnay các bạn làm không xuể đâu

31 tháng 1 2019

1,-12 + x = 5x - 20

-12 + 20 = 5x - x

8 = 4x

x = 2

2, 7x - 4 = 20 + 3x

7x - 3x = 20 + 4

4x = 24

x  = 6

3 , 5x - 7 = -21 - 2x

5x + 2x  = -21 + 7

7x = -14

x = -14 : 7 = -2

4 , x + 15  = 20 - 4x

x + 4x = 20 - 15

5x = 5

x = 5 : 5 = 1

5, 17 - x = 7 - 6x

-x + 6x = 7 - 17

5x = -10

x = -10 : 5 = -2

13 tháng 10 2021

\(a,\Rightarrow\left(35x+3\right)\cdot19=152\\ \Rightarrow35x+3=8\\ \Rightarrow x=\dfrac{1}{7}\\ b,\Rightarrow3\left(x+7\right)=42\\ \Rightarrow x+7=14\Rightarrow x=7\\ c,\Rightarrow3\left(x+1\right)=48\\ \Rightarrow x+1=16\Rightarrow x=15\\ d,\Rightarrow120-5x+100\cdot2:5=4\cdot15\\ \Rightarrow120-5x+40=60\\ \Rightarrow5x=100\Rightarrow x=20\\ e,\Rightarrow4x-10=30\\ \Rightarrow4x=40\\ \Rightarrow x=10\\ g,\Rightarrow10x+10=70\\ \Rightarrow10x=60\\ \Rightarrow x=6\)

a: \(\Leftrightarrow2x-2+4x+8=-12\)

=>6x+6=-12

=>6x=-18

hay x=-3

b: \(\Leftrightarrow-10x-15-12+9x=13\)

=>-x-27=13

=>-x=40

hay x=-40

c: \(\Leftrightarrow-10x+70+20-5x=-15\)

\(\Leftrightarrow-15x=-105\)

hay x=7

d: \(\Leftrightarrow8x-12-7x+14=10\)

=>x+2=10

hay x=8

e: \(\Leftrightarrow-12x-18+14x+2=2\)

=>2x-16=2

hay x=9

5 tháng 2 2016

I don't know