Question

va rog nu inteleg cum se face
DAU COROANA​

Answer 1

Răspuns:

Explicație pas cu pas:

ÎNVATA REGULILE SEMNELOR LA OPERATII

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a)

7-4x-4=-2x-5x-15

-4x+2x+5x= -15-7+4

-2x+5x= -22+4

3x= -18

x=-18:3

x= -6

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b)

3x -4x-8 = -2x -2

3x-4x+2x=8-2

-x+2x=6

x=6

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c)

3x+9-5x+10= 7-7x+2x+6

3x-5x+7x-2x= 7+6-9-10

-2x+7x-2x=  -6

5x-2x=-6

3x= -6

x= -6:3

x=  -2

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d)

10x-5+3x+9+2 = 4x+12 -6x -21

10x+3x-4x+6x= 12-21 +5-9-2

13x-4x+6x= -9+5-9-2

9x+6x= -4-9-2

15x= - 15

x= -15: 15

x=1

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e)

12x-32+12x+18+5=10x-15+2x+30

12x+12x-10x-2x= -15+30+32-18-5

24x-10x-2x= 15+32-18-5

14x-2x=47-18-5

12x= 24

x= 24:12

x=2