25*4*(-15,8)=100*(-15,8)= -1580
0,4*25*0,47=10*0,47=4,7
\sqrt{3x} + \sqrt{3} -3= x x= \sqrt{3x} - \sqrt{3}+3
В первом 2.5, во втором случае ровно 1, удачки
2*√6*sin(8π/3)*cos(25π/4)=3.
1) sin(8π/3)=8*180°/3=sin480°=sin(360°+120°)=sin120°=√3/2.
2) cos(25π/4)=cos(25*180°/4)=cos(25*45°)=cos1125°=
=(3*360+45°)=cos45°=√2/2.
3) 2*√6*(√3/2)*(√2/2)=2*√6*√6/4=6/2=3.