Решение во вложении. Удачи
1) 6 x - 10,2 = 4 x = - 2,2 x/0,2
2 x = 8 X = 4
2) 15 - ( 3 x - 3) = 5 - 4 x - 3 x + 4 x = 5 - 15 - 3 x = - 13
3) 2 x - 1 + 1 = 9
2 x = 9 + 1 - 1
2 x = 9
X = 4, 5
sin16п/3+tg 9п/4+1/2*ctg 5п/6=
=sin p/3 + tg 1/4p + 1/2*(-ctg p/6)=
= sqrt3/2+1-sqrt3/2=1
5²- (х*у)²................................................