Question

Dau coronita imi trebuie urgent.Ex.10,11,12,13,14.

Answer 1

10)
n+2n=84
3n=84
n=84:3
n=28
11)
n+n:2+n:4=63  /*4
4n+2n+n=252
7n=252
n=252:7
n=36
R: 36x2=72
12)
2n+n:4=90  /*4
8n+n=360
9n=360
n=360:9
n=40
13)
3n-n=20
2n=20
n=20:2
n=10
V: 3x10-10=30-10=20
R: 10:2=5  este a doua parte din 10
14)
n-n:8=70  /*8
8n-n=560
7n=560
n=560:7
n=80
V: 80-80:8=80-10=70