Răspuns :
a)(2+5):2=7:2=3.5
b)(4+10):2=14:2=7
c)(11+27):2=38:2=19
d)(0.2+0.8):2=1:2=0.5
e)(0.2+1):2=1.2:2=0.6
f)(1.1+2.7):2=3.8:2=1.9
a,b,c-nr nec
daca sunt consecutive pare atunci b=a+2 si c-b+2=a+2+2=a+4
(a+b+c):3=8
a+a+2+a+4=8*3
3*a+6=24
3*a=24-6
3*a=18
a=18:3
a=6
c=a+4=6+4=10
a,b,c-nr nec
(a+b+c):3=0.5
a+b+c=0.5*3
a+b+c=1.5
b)(4+10):2=14:2=7
c)(11+27):2=38:2=19
d)(0.2+0.8):2=1:2=0.5
e)(0.2+1):2=1.2:2=0.6
f)(1.1+2.7):2=3.8:2=1.9
a,b,c-nr nec
daca sunt consecutive pare atunci b=a+2 si c-b+2=a+2+2=a+4
(a+b+c):3=8
a+a+2+a+4=8*3
3*a+6=24
3*a=24-6
3*a=18
a=18:3
a=6
c=a+4=6+4=10
a,b,c-nr nec
(a+b+c):3=0.5
a+b+c=0.5*3
a+b+c=1.5