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B)[(10:x+630:9)•4+6]•3=918 ( metoda mersului invers Dau coroana

Răspuns :

DanTDM
[(10:x+70)•4+6]=306
(10:x+70)•4=300
10:x+70=75
10:x=5
x=10:5
x=2
Vreauominune
[(10:×+70)•4+6]•3=918/:3
[(10:x+70)•4+6]=306/-6
(10:x+70)•4=300/:4
10:x+70=75/-70
10:×=5
x=10:5
×=2