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ultimele trei de jos va rogggggg!!!

Ultimele Trei De Jos Va Rogggggg class=

Răspuns :

a+3/4=7/4
a=7/4-3/4
a=4/4

2/7+a=1(7/7)
a=7/7-2/7
a=5/7

a-2/7=3/7
a=3/7+2/7
a=5/7

2-a=1/2
2=4/2
4/2-a=1/2
a=4/2-1/2
a=3/2