5/12 у - 4/15 у = 2 1/4
25/60у-16/60у=9/4 З/20у=9/4 У=9/4:
3/20=9/4*20/3
y=15
вроде так !
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5/12 у - 4/15 у = 2 1/4
25/60у-16/60у=9/4 З/20у=9/4 У=9/4:
3/20=9/4*20/3
y=15
вроде так !