## Làm giùm điiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

Question

Làm giùm điiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

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9 months 2021-04-23T13:23:38+00:00 2 Answers 3 views 0

## Answers ( )

1. a) 3 1/2 – 1/2x = 2/3

⇔7/2 – 1/2x = 2/3

⇔1/2x = 7/2 – 2/3

⇔1/2x = 21/6 – 2/6

⇔1/2x = 19/6

⇔x = 19/6 : 1/2

⇔x = 19/6 x 2

⇔x = 19/3

b) 1/3 + 2/3 : x = -7

⇔2/3 : x = -7 – 1/3

⇔2/3 : x = -21/3 – 1/3

⇔2/3 : x = -22/3

⇔x = 2/3 : -22/3

⇔x = 2/3 x 3/-22

⇔x = -1/11

d) (2x – 3)(6 – 2x) = 0

⇔[2x-3 = 0

[6-2x=0

⇔[2x=0+3

[2x=2-0

⇔[2x=3

[2x=6

⇔[x=3:2

[x=6:2

⇔[x=3/2

[x=3

2. *Lời giải :

a) 3 1/2 – 1/2x = 2/3

-> 7/2 – 1/2x = 2/3

-> 1/2x = 7/2 – 2/3

-> 1/2x = 17/6

-> x = 17/6 : 1/2

-> x = 17/3

Vậy x = 17/3

b) 1/3 + 2/3 😡 = -7

-> 2/3 : x = -7 – 1/3

-> 2/3 : x = (-22)/3

-> x = 2/3 : (-22)/3

-> x = (-1)/11

Vậy x = (-1)/11

c) 1/3x + 2/5 (x – 1) = 0

-> 1/3x + 2/5x – 2/5 = 0

-> (1/3 + 2/5) . x = 0 + 2/5

-> 11/15x = 2/5

-> x = 2/5 : 11/15

-> x = 6/11

Vậy x = 6/11

d) (2x – 3) (6 – 2x) = 0

-> $$\left[ \begin{array}{l}2x-3=0\\6-2x=0\end{array} \right.$$

-> $$\left[ \begin{array}{l}2x=3\\2x=6\end{array} \right.$$

-> $$\left[ \begin{array}{l}x=\dfrac{3}{2}\\x=3\end{array} \right.$$

Vậy x=  3/2 hoặc x = 3