Question

Sa ma ajute cineva la exercitiul urmator: 15:[11-(7x5-9x9:X:3):8+2x4]x3=3.Va rog trebuie sa il aflu pe X.

Answer 1

15:[11-(7·5-9·9:x:3):8+2·4]·3=3
15:[11-(35-81:x:3):8+8]=3:3
15:[11-(35-81:3:x):8+8]=1
[11-(35-27:x):8+8]=15·1
11-(35-27:x):8=15-8
11-(35-27:x):8=7
(35-27:x):8=11-7
(35-27:x):8=4
(35-27:x)=4·8
35-27:x=32
27:x=35-32
27:x=3
x=27:3
x=9
verificare
15:[11-(7·5-9·9:9:3):8+2·4]·3=3
15:[11-(35-81:9:3):8+8]:3=3
15:[11-(35-3):8+8]:3=3
15:(11-32:8+8):3=3
15:(11-4+8):3=3
15:15:3=3
15:5=33=3