Răspuns :
Răspuns
Explicație pas cu pas:
a) 2 / 15 + 7 / 10 - 5 / 6 = 0
= ( 2 × 2 ) / 30 + ( 7 × 3 ) / 30 - ( 5 × 5 ) / 30 =
= 4 / 30 + 21 / 30 - 25 / 30 =
= 25 / 30 - 25 / 30 =
= 0
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b) 7 / 10 - 3 / 5 + 1 / 2 = 3 / 5
= 7 / 10 - 6 / 10 + 5 / 10 =
= ( 7 - 6 + 5 ) / 10 =
= 6 / 10 =
= 3 / 5
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c) 3 / 14 + 1 / 21 - 1 / 6 = 2 / 21
= 9 / 42 + 2 / 42 - 7 / 42 =
= 11 / 42 - 7 / 42 =
= 4 / 42 = → simplific cu 2
= 2 / 21
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d) 60 - ( 1 / 3 - 3 / 10 + 2 / 15 ) = 359 / 6
= 60 - ( 10 / 30 - 9 / 30 + 4 / 30 ) =
= 60 - 5 / 30 =
= 60 - 1 / 6 =
= ( 360 - 1 ) / 6 =
= 359 / 6
= 59 intregi si 5 / 6