1. sin2x= 1/2
2x = (-1)^k+1*arcsin 1/2 + π*n
2x = (-1)^k+1*π/6 + π*n
x = (-1)^k+1*π/12 + π/2*n
Ответ: (-1)^k+1*π/12 + π/2*n
2. log2(3+x)=7
log2(3+x)=2^7
3+x=128
x=125
3. √(63-6x)=3
√(63-6x)²=3²
63-6x=9
6x=54
x=9
4. 3^x+9= 1/9
3^x+9= 3^-2
x+9=-2
x= -11