Question

matematica pls repede
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Answer 1

Răspuns:

a)5x-2(x-7)-9=x+15

5x-2x+14-9=x+15

5x-2x-x=15-14+9

2x=10-->x=5

b)3(2x+7)-14=2(2x-5)+3

6x+21-14=4x-10+3

6x-4x=-10+3-21+14

2x=-14-->x=-7

c)2[3(2x-3)-8]-9=5

2(6x-9-8)-9=5

12x-18-16-9=5

12x=5+18+16+9

12x=48-->x=4

d)3(3x+4)-5=2(2x+7)+13

9x+12-5=4x+14+13

9x-4x=14+13-12+5

5x=20-->x=4

Answer 2

Răspuns:

5x - 2(x-7) - 9 = x + 15

5x - 2x + 14 - 9 = x - 15

2x = - 20

x = -10

2[3(2x - 3) - 8] - 9 =5

2(6x - 17) - 9 = 5

12x - 34 - 9 = 5

12x - 43 =5

12x = 48

x = 4

3(2x + 7) - 14 = 2(2x - 5) + 3

6x + 21 - 14 = 4x - 10 + 3

6x + 7 = 4x - 7

2x = -14

x = -7

3(3x + 4) - 5 = 2(2x + 7) + 13

9x + 12 - 5 = 4x + 14 + 13

9x +7 = 4x +27

9x - 4x = 27 - 7

5x = 20

x = 4