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Marcelaberar
a fost răspuns

[(100+x)÷75-1)]×35=875

Răspuns :

Rodi11
[(100+x)÷75-1]×35=875
(100+x)÷75-1)=875:35
(100+x):75-1=25
(100+x):75=25+1
(100+x):75=26
100+x=26×75
100+x=1950
x=1950-100
x=1850

Probă :

[(100+1850)÷75-1)]×35=
=(1950:75-1)×35=
=(26-1)×35=
=25×35=
=875 (adevarat )




Cocirmariadenis

[ ( 100 + x ) : 75 - 1 ] × 35 = 875

( 100 + x ) : 75 - 1 = 875 : 35

( 100 + x ) : 75 - 1 = 25

( 100 + x ) : 75 = 25 + 1

( 100 + x ) : 75 = 26

100 + x = 26 × 75

100 + x = 1 950

x = 1950 - 100

x = 1 850 → numarul, aflat prin metoda mersului invers