Question

Afla valoarea numarului A: a) paranteza patrata (16 -2 x 2+4 x 2):a inchedem paranteza patrata+3=8 b) 5+15 x (25-75:5+25:a)=1150:5 c) 3+2 x acolada deschisa si paranteza patrada deschisa 72-12 x (a-3)inchidem paranteza patrata-9 x 4 inchidem acolada=27 Va rog!!!

Answer 1

a) [(16-4+8):a]= 8-3 20:a= 5 a=20:5 a=4 b) 5+15x(25-75:5+25:a)=1150:5 5+15x(25-15+25:a)=230 5+15x25-15x15+15x (25:a)=230 5+375-225+15x (25:a)=230 155+15x (25:a)= 230 15x (25:a)=230-155 25:a=75:15 a=25:5 a=5 c) 3+2x { [ 72-12x(a-3)]-9x4}=27 3+2x [(72-12x a +36)-36]=27 3+2x(72-12x a +36-36)=27 3+2x(72-12x a)=27 3+2x72-24x a =27 3+144-24x a =27 -24x a= 27-3-144 24x a=120 a=120:24 a=5