Rozwiązane

Rozwiąż równania, zapisz wszystkie obliczenia:
7x-3+2x=15



4x-8 =-6 +3x



2(x+1)+6=4(2 – 3x) -4



15x +2= 13x-4
pls na teraz daje naj

Odpowiedź :

7x - 3 + 2x = 15

7x + 2x = 15 + 3

9x = 18 / : 9

x = 2

4x - 8 = -6 + 3x

4x - 3x = -6 + 8

x = 2

2(x + 1) + 6 = 4(2 - 3x) - 4

2x + 2 + 6 = 8 - 12x - 4

2x + 12x = 8 - 4 - 2 - 6

14x = -4 / : 14

x = -2/7

15x + 2 = 13x - 4

15x - 13x = -4 - 2

2x = -6 / : 2

x = -3

Kontonawszystkoviz

[tex]7x - 3 + 2x = 15 \\ 9x - 3 = 15 \\ 9x = 15 + 3 \\ 9x = 18 \: \: \: \: \: \: | \div 9 \\ x = 2[/tex]

[tex]4x - 8 = - 6 + 3x \\ 4x - 3x = - 6 + 8 \\ x = 2[/tex]

[tex]2(x + 1) + 6 = 4(2 - 3x) - 4 \\ 2x + 2 + 6 = 8 - 12x - 4 \\ 2x + 8 = - 12 x+ 4 \\ 2x + 12x = 4 - 8 \\ 14x = - 4 \: \: \: \: \: | \div 14 \\ x = - \frac{4}{14} \\ x = - \frac{2}{7} [/tex]

[tex]15x + 2 = 13x - 4 \\ 15x - 13x = - 4 - 2 \\ 2x = - 6 \: \: \: \: \: | \div 2 \\ x = - 3[/tex]