Question

cum se calculează (39-a:7):5×8-48=0​

Answer 1

$(39 - a \div 7) \div 5 \times 8 = 48$

$(39 - a \div 7) \div 5 = 48 \div 8$

$(39 - a \div 7) \div 5 = 6$

$39 - a \div 7 = 6 \times 5$

$39 - a \div 7 = 30$

$- a \div 7 = 30 - 39$

$a \div 7 = 9$

$a = 63$

Verificare: (39-63:7):5*8-48=(39-9):5*8-48=30:5*8-48=6*8-48=48-48=0

Answer 2

Răspuns:   a = 63

Explicație pas cu pas:

Este un exercitiu care se rezolva prin metoda mersului invers:

( 39 - a : 7 ) : 5 × 8 - 48 = 0

( 39 - a : 7 ) : 5 × 8 = 0 + 48

( 39 - a : 7 ) : 5 × 8 = 48

( 39 - a : 7 ) : 5 = 48 : 8

( 39 - a : 7 ) : 5 = 6

39 - a : 7 = 6 × 5

39 - a : 7 = 30

a : 7 = 39 - 30

a : 7 = 9

a = 9 × 7

a = 63

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Verific:

( 39 - 63 : 7 ) : 5 × 8 - 48 = ( 39 - 9) : 5 × 8 - 48 = 6 ×8 - 48 = 48 - 48 = 0