Question

Afla numerele necunoscute. A) 450 - 12 × a= 330 B) 935- a +72×12 = 1500 repede, va rog

Answer 1

a) 450-12*a=330
12*a=450-330
12*a=120
a=10

b) 935-a +72*12 = 1500
935-a+864=1500
935-a=1500-864
935-a=636
a=299

Answer 2

 A)
 450 - 12 × a= 330
12 × a = 450 - 330
12 × a = 120 
a = 120 : 12
a = 10

Verific:
450 - 12 x 10 = 450 - 120 = 330

 B)
 935 - a +72×12 = 1500
935 - a + 864 = 1 500
935 - a = 1 500 - 864
935 - a = 636
a = 935 - 636
a = 299

Verific:   935 - 299 + 864 = 636 + 864 = 1 500