Răspuns
Explicație pas cu pas:
a) 1 / 15 + 2 / 3 = 11 / 15
=> amplific fractia 2 / 3 cu 5
= 1 / 15 + ( 2 × 5 ) / ( 3 × 5 ) =
= 1 / 15 + 10 / 15 =
= 11 / 15
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b) 3 / 7 + 9 / 14 =
=> amplific fractia 3 / 7 cu 2
= ( 3 × 2 ) / ( 7 × 2 ) + 9 / 14 =
= 6 / 14 + 9 / 14 =
= ( 6 + 9 ) / 14 =
= 15 / 14 =
= 1 intreg si 1 / 14
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c) 2 / 3 + 1 / 6 = 5 / 6
=> amplific fractia 2 / 3 cu 2
= ( 2 × 2 ) / ( 3 × 2 ) + 1 / 6 =
= 4 / 6 + 1 / 6 =
= 5 / 6
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d) 8 / 9 + 5 / 18 = 21 / 18
=> amplific fractia 8 / 9 cu 2
= ( 8 × 2 ) / ( 9 × 2 ) + 5 / 18 =
= 16 / 18 + 5 / 18 =
= ( 16 + 5 ) / 18 =
= 21 / 18 =
= ( 21 : 3 ) / ( 18 : 3 ) = => simplific fractia cu 3
= 7 / 6 =
= 1 intreg si 1 / 6
