Răspuns:
Explicație pas cu pas:
a / b = 2 / 3 => a = 2; b = 3
( 3 a - b ) / ( a + b )= ( 3 × 2 - 3 ) / ( 2 + 3 ) = 3 / 5
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sau: a / b = 2 / 3 ⇒ 2 b = 3 a ⇒ b = 3 a / 2
( 3 a - 3 a / 2 ) / ( a + 3 a / 2 ) = 3 / 5
= ( 6 a - 3 a ) / 2 : ( 2 a + 3 a ) / 2 =
= ( 3 a / 2 ) × ( 2 / 5 a ) = 3 / 5
