Х:42=38
х=38•42
х=1596
1596:42=38
38=38
ответ: х=1596
х:73=126
х=126•73
х=9198
9198:73=126
126=126
ответ: х=9198
Sin[2arcsin(-1/2)+π/3]=sin[2*(7π/6)+π/3]=sin[(7π/3)+π/3]=
=sin(8π/3) = sin((9π/3)+π/3) = sin(π-π/3)=sin(π/3)=√3/2
-2+2<3х+1+2<7+2
3х+1+2<9
3х<9-1-2
х<2
2<5х-3<17
2-2<5х-3-2<17-2
5х-3-2<15
5х<15+3+2
х<4
3<7-4х<15
3-3<7-4х-3<15-3
7-4х-3<12
-4х<12-7+3
х>-2
О т в е т по формулам : б), в), г)