Sin 7π/3 = sin (2π + π/3) = sin π/3 = sqrt3/2
cos 7π/3 = cos (2π + π/3) = cos π/3 = 1/2
tg 7π/3 = tg (2•π + π/3) = tg π/3 = sqrt3
ctg 7π/3 = ctg (2•π + π/3) = ctg π/3 = sqrt3/3
1) (12*5+20)/4=20
2)12*(5+20)/4=75
3)12*(5+20/4)=120
1)10000/(200-20*5)100
2)(1000/200-20)*5=150
3)10000/(200-20)*5=500