dau coroana! urgent!

a x 3 + 3 - 20 + 20 = 33a x 3 + 3 = 33a x 3 = 33-3a x 3 = 30a = 30:3a = 10

Semiperimetru = perimetru:2=> perimetru = 2x semiperimetru=> perimetru = 20u.m.
Latura = perimetru:4 = 20:4 = 5u.m.
Deci, suma celor 4 laturi este de fapt perimetrul, adica 20 unitati de masura.

a × 3 + 18 ÷ 6 - 4 × 5 + 2 × 10 = 33
a × 3 + 3 - 20 + 20 = 33
a × 3 + 3 - 20 = 33 - 20
a × 3 + 3 - 20 = 13
a × 3 + 3 = 13 + 20
a × 3 + 3 = 33
a × 3 = 33 - 3
a × 3 = 30
a = 30 ÷ 3
a = 10
V: 10 × 3 + 18 ÷ 6 - 4 × 5 + 2 × 10 = 33 = > A
30 + 3 - 20 + 20 = 33
33 - 20 + 20
13 + 20
33




Succes!!!❤❤