74-7>74-8
53-1<53-0
62-8>62-12
44-1>74-37
83-4<83-3
91-7>91-12
690+90:z=705 <span>(415 +65 ) : w =80</span>
90:z=705-690 480:w=80
90:z=15 w=480:80
z=90:15 w=6
z=6
1-1/6=5/6
2+1/6=2 1/6=13/6
5/6:13/6=5/6*6/13=5/13
=2cos(2x-3)\cos(2x-3) = -2sin(2x-3)\cos(2x-3)
2= - 2sin(2x-3)\cos(2x-3)
2=2tg(3-2x)
2tg(3-2x)=2
tg(3-2x)=1
3-2x= pi\4 +piK
x= - pi+4piK-12\8