Question

Afla numarul necunoscut din expresiile:A) (a+27:3)x5=95; B)2+bx9-25=40; C) (c-104+2)x5+3=98; D) (dx4+20):4=12

Answer 1

A)(a+27:3)x5=95<=>(a+9)x5=95<=>5a+45=95<=>5a=95-B)45<=>5a=50<=>a=50:5=>a=10
2+bx9-25=40<=>bx9=40+25-2<=>9b=63<=>b=63:9=>b=7
C)(c-104+2)x5+3=98<=>(c-106)x5=98-3<=>5c-530=95<=>5c=95+530<=>5c=625<=>c=625:5=>c=125
D)(dx4+20):4=12<=>4d+20=12x4<=>4d+20=48<=>4d=48-20<=>4d=28<=>d=28:4=>d=7