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Afla valoare lui x din:
77-(7+x:7)×7=7


Răspuns :

Deva
(7+x:7)x7=77-7=70
7+x:7=70:7=10
x:7=10-7=3
x=3x7=21
77-( 7+ x : 7) x 7= 7
= (7+x:7) x 7 = 77-7
=(7+x:7) x 7 = 70
= 7+x:7= 70 : 7
= 7+x:7= 10
= x: 7 = 10 - 7
=x:7 = 3
=x= 3 x 7
=x= 21
V: 77 -( 7+21:7) x 7 = 
= 77 - (7+3) x 7 = 
= 77- 10 x 7 =
= 77 - 70=
= 7