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rezolvati folosind metoda mersului invers ecuatia:(13•x-416:4):7=13

Răspuns :

( 13 · x - 416 : 4 ) : 7 = 13

13 · x - 104 = 13 × 7

13 · x = 91 + 104

13 · x = 195

x = 195 : 13

x = 15 → numarul, aflat prin metoda mersului invers

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