Question

va rog
am nevoie urgent
dau coroana ​

Answer 1

Răspuns:

Explicație pas cu pas:

a)

(2x - 1)/3 - (x - 2)/4 = 3/2

4(2x - 1)/12 - 3(x - 2)/12 = 18/12

4(2x - 1) - 3(x - 2) = 18

8x - 4 - 3x + 6 = 18

5x = 18 - 6 + 4 = 16

x = 16/5

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b)

7 - (3x - 1)/4 = (2x - 5)/3 + 8

-(3x - 1)/4 - (2x - 5)/3 = 8 - 7 = 1

-3(3x - 1)/12 - 4(2x - 5)/12 = 12/12

-9x + 3 - 8x + 20 = 12

-17x = 12 - 20 - 3

-17x = -11

x = 11/7

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c)

x - 3 = 7 sau -7

x - 3 = 7

x = 7 + 3 = 10

x - 3 = -7

x = -7 + 3 = -4

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d)

2x - 5 = 3 sau -3

2x = 8 sau 2

x = 4 sau 1

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e)

3x + 5 = 0

3x = -5

x = -5/6

sau

x - 6 = 0

x = 6

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f)

x = 0

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h)

3(3x + 5)/12 - 6(2x - 1)/12 = 1/12

3(3x + 5) - 6(2x - 1) = 1

9x + 15 - 12x + 6 = 1

-3x + 21 = 1

3x = 21 - 1 = 20

x = 20/3

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i)

(x + 5)/2 - 15/2 = (3x - 4)/3

3(x + 5)/6 - 45/6 = 2(3x - 4)/6

3x + 15 - 45 = 6x - 8

6x - 3x = 15 - 45 + 8

3x = -22

x = -22/3

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j)

2x - 5 = 9 sau -9

2x = 14 sau - 4

x = 7 sau -2

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k)

2x - 9 = 0

2x = 9

x = 9/2

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l)

6y - 7 = 0

6y = 7

y = 7/6

y + 19 = 0

y = -19

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m)

3x + 4 = 0

3x = -4

x = -4/3