1) 75+n=50x25
N=1250-75
N=1175(a)
3)
76,5:6=12,75 costa o carte
6
16
12
=45
...42
....=30
.......30
.......==
12,75x
5
63,75(c)
5)3 u+4v=258,3/x(2)
7u+8v=549,1
6u+8v=516,6
7u+8v=549,1
(6u+8v)-(7u+8v)=516,6-549,1
6u+8v-7u-8v= - 32,5
-u= - 32,5
U=32,5 (ursuleti) (A)
7)a+b=63
A=2,5b
2,5b+b=63
3,5b=63
B=18
A=2,5x18
A=45 varianta (B)
9)(72+78,5+74,8+81,1):4=306,4:4=76,6(D)
11)luni:30-27=3 lipsa
Marti-
Miercuri 30-28=2 lipsa
Joi:30-29=1 lipsa
Vineri :30-26=4 lipsa
3+0+2+1+4=10(B)