Question

afla termenul necunoscut prin metoda mersului invers [( 13 + 12 × m ) × 10 - 330 ] : 100 = 13

Answer 1

[(13+12*m)*10-330]:100=13
(13+12m)*10-330=13*100
(13+12m)*10-330=1300
(13+12m)*10=1300+330
(13+12m)*10=1630
13+12m=1630:10
13+12m=163
12m=163-13
12m=150
m=150:12
m=12,5

metoda inversa

{[[13*100)+330]:10}-13=12m
[(1300+330):10]-13=12m
(1630:10)-13=12m
163-13=12m
150=12m
m=150:12
m=12,5