Question

Cum calculez x din egalitatile;

a) X supra 2 = 21 supra 6

b) a supra 20 = 7 supra 5

Answer 1

a) x=2*21:6=>x=42:6=>x=7
b) a=20*7:5=>a=4*7=>a=28

Answer 2

a) facem produsul mezilor si extremilor
x/2=21/6
6x=21·2
6x=42
x=42/6
x=7

b)a/20=7/5
5a=7·20
5a=140
a=140/5
a=28