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Cum se face nr 3? Dau coroana.

Cum Se Face Nr 3 Dau Coroana class=

Răspuns :

3)

1 + [ 2 × ( 1 + c ) - 59 ] × 9 = 10

[ 2 × ( 1 + c ) - 59 ] × 9 = 10 - 1

[ 2 × ( 1 + c ) - 59 ] × 9 = 9

[ 2 × ( 1 + c ) - 59 ] = 9 : 9

[ 2 × ( 1 + c ) - 59 ] = 1

2 × ( 1 + c ) = 1 + 59

2 × ( 1 + c ) = 60

1 + c = 60 : 2

1 + c = 30

c = 30 - 1

c = 29