Răspuns :
a+a:2+2a=140 amplificam
2a+a+4a=280
7a=280
a=280:7
a=40
Răspuns:
²⁾a+a/2+²⁾2a=²⁾140
2a+a+4a=280
7a=280
a=280:7
a=40
verificare:
40+40:2+2·40=40+20+80=140
a+a:2+2a=140 amplificam
2a+a+4a=280
7a=280
a=280:7
a=40
Răspuns:
²⁾a+a/2+²⁾2a=²⁾140
2a+a+4a=280
7a=280
a=280:7
a=40
verificare:
40+40:2+2·40=40+20+80=140