Question

2) 12 elevi termina un proiect in 6 zile.18 elevi ar termina acelasi proiect in ? zile.
3) Solutia ecuatiei 4/7 + x/14 = 5/4 este x=?
6) a) Stiind ca numerele x si y sunt direct proportionale cu 2 si 3,sa se calculeze 3x-y/2y-x
b) Daca 4x+y/3y-x = 3/2,sa se afle raportul numerelor x si y
3)Calculati 0,5:[1 / 3+1 / 3 la 2 - 0,1(6)]
4)Aratati ca numarul A=3x2 la n+2 la n+1 + 5x2 la n+1 + 2 la n+3

Answer 1

12...................6z
18e..................?
?=18*6/12=9z

4/7+x/14=5/4
x/14=5/4-4/7
x/14=(19/28)
x=14*19/28
x=19/2

0.5:[1/3+1/3²-15/90]
5/10:5/18=18/10=9/5
la ultimul,care este intrebarea?