Question

varog rezolvati
a)(410 - t) : 7 + 70 = 120
b)(z : 9) x 15 - 47 = 28

Answer 1

a )

( 410 - t ) : 7 + 70 = 120

( 410 - t ) : 7 = 120 - 70

( 410 - t ) : 7 = 50

410 - t = 50 × 7

410 - t = 350

t = 410 - 350

t = 60 → numarul, aflat prin metoda mersului invers

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b)

( z : 9 ) × 15 - 47 = 28

( z : 9 ) × 15 = 28 + 47

( z : 9 ) × 15  = 75

z : 9 = 75 : 15

z : 9 = 5

z = 5 × 9

z = 45

Verific:  ( 45 : 9 ) × 15 - 47 = 5 × 15 - 47 = 75 - 47 = 28