Odpowiedź :
1)
[tex]-10x-13=77\\\\-10x=77+13\\\\-10x=90 \ \ |:(-10)\\\\x=-9[/tex]
2)
[tex]5b-8=-5\\\\5b=-5+8\\\\5b=3 \ \ |:5\\\\b=0,6[/tex]
3)
[tex]-x+12=7\\\\-x=7-12\\\\-x=-5 \ \ |:(-1)\\\\x=5[/tex]
4)
[tex]5a-3=27\\\\5a=27+3\\\\5a=30 \ \ |:5\\\\a=6[/tex]
5)
[tex]-3y-7=-11\\\\-3y=-11+7\\\\-3y=-4 \ \ |:(-3)\\\\x=\frac{4}{3}=1\frac{1}{3}[/tex]
Odpowiedź:
- 10x - 13 = 77
- 10x = 77 + 13 = 90 / : (- 10)
x = - 9
5b - 8 = - 5
5b = - 5 + 8
5b = 3 / : 5
x = 3/5
- x + 12 = 7
- x = 7 - 12
- x = - 5 / (- 1`)
x = 5
5a - 3 = 27
5a = 27 + 3
5a = 30 / : 5
a = 6
- 3y - 7 = -11
- 3y = - 11 + 7
- 3y = - 4 / : (- 3)
y = 4/3
Szczegółowe wyjaśnienie: