Răspuns:
11. 3l+6c=51/*(-4)
4l+5c=50/*3
-12l-24c=-204
12l+15c=150
-9c=-54
crizanteme: 6
3l+36=51
3l=15
lalele:5
12. {[(x-6):2]+13}*5=100/:5
[(x-6):2]+13=20/-13
(x-6):2=7/*2
x-6=14/+6
x=20
13. (a+b):2=17
(a+c):2=11,5
(b+c):2=12,5
a) a+b=17*2=34
Explicație pas cu pas:
