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Nr x din egalitatea [(x-1) : 100+90]:10-10=0   este:

a)1000
b)101
c)1001
d)999


Răspuns :

[(x-1):100+90]:10=10
(x-1):100+90=10*10
(x-1):100+90=100
(x-1):100=100-90
(x-1):100=10
(x-1)=10*100
x-1=1 000
x=1 000+1
x=1 001

 [ ( x - 1 ) : 100 + 90 ] : 10 - 10 = 0

( D : 100 + 90 ) : 10 = 0 + 10

( S + 90 ) : 10 = 10

S + 90 = 10 x 10

S + 90 = 100

S = 100 - 90

S = 10

D : 100 = 10

D = 100 x 10

D = 10000

x - 1 = 1000

x = 1000 + 1

x = 1001