Rezolvați,folosind metoda mersului , invers:
a) (13•x-416:4):7=13


Răspuns :

(13×x-416:4):7=13
13x-104=13×7
13x-104=91
13x=195
x=195:13
x=15
(13•x-416:4):7=13
(13•x-104):7=13
13•x-104=13•7
13•x-104=91
13•x=91+104
13•x=195
x=195:13
x=15