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afla nr necunoscute din exercițiu 7+6×(x÷4-18)=25

Răspuns :

7 + 6 × ( x : 4 - 18 ) = 25

6 × ( x : 4 - 18 ) = 25 - 7

6 × ( x : 4 - 18 ) = 18

x : 4 - 18 = 18 : 6

x : 4 - 18 = 3

x : 4 = 3 + 18

x : 4 = 21

x = 21 × 4

x = 84

Verificare:

7 + 6 × ( 84 : 4 - 18 ) = 7 + 6 × ( 21 - 18 ) = 7 + 6 × 3 = 7 + 18 = 25

7+6*(x/4-18)=25
6*(x/4-18)=25-7=18
x/4-18=18/6=3
x/4=18+3=21
x=21*4
x=84