5√(3*25)+2√(9*3)-0,25√(16*3)-9√3=25√3+6√3-√3-9√3=31√3-10√3=21√3
(u-5)(5u+1)(3u-5)=(5u^2 +u- 25u-5)(3u-5)= 15u^3-15u^2+3u^2-5u-75u^2+125u -15u + 25=15u^3- 87n^2+105u + 25
㏒₂㏒₂⁴√2=㏒₂㏒₂(2)¹/⁴=㏒₂1/4㏒₂2 =㏒₂1/4=㏒₂2⁻² =-2㏒₂2 =-2
1) 5z(z^2-1)=0
5z=0, z=0
z^2-1=0, (z-1)(z+1)=0, z=1, z= - 1
2) z(1-9z^2)=0
z=0
1-9z^2= 0, (1-3z)(1+3z)= 0, z=1/3, z= - 1/3