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-4/5 = - 8/10; - 12/15; -16/20; -20/25
0,2 = 2/10; 4/20; 6/30; 8/40
-8 = - 16/2 ; - 32/4 ; - 40/5 ; - 48/6
0,5 = 1/2 ; 2/4 ; 3/6 ; 4/8