12. Приведите дроби к общему знаменателю.
a) (4/9; 9/27) b) (7/8; 5/6) c) (1/13; 9/39) d) (35/50; 64/80) e) (14/20 ; 35/50)
a) (4/9; 9/27) b) (7/8; 5/6) c) (1/13; 9/39) d) (35/50; 64/80) e) (14/20 ; 35/50)
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b)48
c)13
d)400
e)100