Sin2x=0,5
2x=(-1)^n * π/6+πn
x=(-1)^n * π/12+πn/2
-3(n+2)-14=-5
-3n-6-14=-5
-3n=-5+6+14
-3n=15
n=15/(-3)
n=-5
О)
3 7/30-1 5/12=3 14/60-1 25/60=
=2 74/60-1 25/60=1 49/60
1 49/60÷18 1/6=109/60÷109/6=
=109/60×6/109=1/10
п)
1 1/2+2 2/3=1 3/6+2 4/6=3 7/6=
=4 1/6
4 1/6÷1 2/3=25/6÷5/3=25/6×3/5=
=5/2=2 1/2
р)
11/18-1 7/12=11/18-19/12=
=22/36-57/36=-35/36
2 1/6+7/30=2 5/30+7/30=2 12/30=
=2 6/15
-35/36×2 6/15=-35/36×36/15=
=-7/3=-2 1/3
с)
3 2/5-5=-1 3/5
31/48+7/24=31/48+14/48=45/48
-1 3/5×45/48=-8/5×45/48=-3/2=
=-1 1/2
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