ma anutati va rog la ex 11 si 12 dau coroana
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Explicație pas cu pas:
11. 30/30=1
120/90=40/30=4/3
30/6=5/1=5
12. a=2/3+5/3
a=7/3
x=1/1-39/70
x=70/70-39/70
x=31/70
x×39=13×3
x×39=39
x=39:39
x=1