Question

Rezolvati in Q ecuatiile:
$a. \: \frac{2}{3} x - \frac{1}{5} = \frac{3}{10} \\ \\ b. \: \frac{x}{2} - \frac{4x}{3} + \frac{7x}{6} = 7$
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Answer 1

Răspuns:

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Answer 2

a) 2/3x - 1/5 = 3/10 / × 30

30 × ( 2/3x - 1/5 ) = 30 × 3/10

30 × 2/3x - 30 × 1/5 = 9

10 × 2x - 6 = 9

20x - 6 = 9

20x = 9 + 6

20x = 15

x = 15/20

x = 3/4

b) x/2 - 4x/3 + 7x/6 = 7 / × 6

6 × ( x/2 - 4x/3 + 7x/6 ) = 6 × 7

6 × x/2 - 6 × 4x/3 + 6 × 7x/6 = 6 × 7

3x - 2 × 4x + 7 = 42

3x - 8x + 7x = 42

2x = 42

x = 42/2

x = 21