Question

Tìm x :

1) (2x - 5 ) + 17 = 6

2) 10 - 2(4 - 3x) = -4

3) -12 + 3(-x + 7) = -18

4) 24 : (3x - 2) = -3

5) -45 : 5 . (-3 - 2x) = 3

Answer 1

1 ) \(\left(2x-5\right)+17=6\)

\(\Leftrightarrow2x-5=-11\)

\(\Leftrightarrow2x=-6\)

\(\Leftrightarrow x=-3\)

Vậy \(x=-3.\)

2 ) \(10-2\left(4-3x\right)=-4\)

\(\Leftrightarrow2+6x=-4\)

\(\Leftrightarrow6x=-6\)

\(\Leftrightarrow x=-1\)

Vậy \(x=-1.\)

3 ) \(-12+3\left(-x+7\right)=-18\)

\(\Leftrightarrow3x+9=-18\)

\(\Leftrightarrow3x=-27\)

\(\Leftrightarrow x=-9\)

Vậy \(x=-9.\)

4 ) \(24:\left(3x-2\right)=-3\)

\(\Leftrightarrow\left(3x-2\right)=-8\)

\(\Leftrightarrow3x=-6\)

\(\Leftrightarrow x=-2\)

Vậy \(x=-2.\)

5 ) \(-45:5.\left(-3-2x\right)=3\)

\(\Leftrightarrow-9\left(-3-2x\right)=3\)

\(\Leftrightarrow18x+27=3\)

\(\Leftrightarrow18x=-24\)

\(\Leftrightarrow x=-\frac{4}{3}\)

Vậy \(x=-\frac{4}{3}.\)

Answer 2

1) (2x-5)+17=16

2x-5 =16-17

2x-5 = -1

2x =-1+5

2x =4

x =2

Answer 3

(2x - 5) + 17 = 6

=> 2x - 5 = -11

=> 2x = -11 + 5

=> 2x = -6

=> x = -3

Answer 4

1) (2x-5)+17=6

=> 2x-5 = 6-17

=> 2x-5 = -11

=> 2x =-11+5

=> 2x =-6

=> x= -6:2

=> x = -3

2) 10-2(4-3x) = -4

=> 2(4-3x) = 10- (-4)

=> 2(4-3x) = 14

=> (4-3x)= 14:2

=> 4-3x = 7

=> 3x = 4-7

=> 3x = -3

=> x= -3:3

=> x=-1

3) -12 + 3(-x+7) = -18

=> 3(-x+7)= (-18)-(-12)

=> 3(-x+7)= -6

=> -x+7 = -6:3

=> -x+7 = -2

=>.-x = -2-7

=> -x = -9