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calculati folosind proprietatile adunarii 2/7 + 3/5 + 5/7 + 2/5 b) 3/8 + 2/7 + 3/7 + 5/8 + 2/7 plz.

Răspuns :

a.)2/7 + 3/5 + 5/7 + 2/5 =
2/7+ 5/7+ 3/5+ 2/5=
7/7+ 5/5= 1+1= 2

b) 3/8 + 2/7 + 3/7 + 5/8 + 2/7=
3/8+ 5/8+ 2/7+3/7+2/7=
8/8+ 7/7= 1+1= 2
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