1) 16 - 5 = 11
2) 13 - 7 = 6
3) 10 - 1 = 9
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33/40=(20+5+8)/40=20/40+5/40+8/40=1/2+1/8+1/5
12×(13/24-7/12-1/6)=-5/12
1)13/24-7/12=13/24-14/24=-(14/24-13/24)=-1/24
2)-1/24-1/6=-1/24-4/24=-(1/24+4/24)=-5/24
3)12×(-5/24)=-5/12
ответ:-5/12
= 6/4у + 2/4у +5/y^2 -4 = 8/4у + (5 -4*y^2)/y^2 = (2y +5 -4y^2)/y^2