1)х(у+5)+1(5+3)=(х+1)(х+5)
2)а(с-b)-1(c-b)=(a-1)(c-b)
3)a(b-c)-4(b-c)=(a-4)(b-c)
7x^2+6x+1=0
D=36-28=8=2√2
x=(-6<span>±2</span>√2)/14
x₁=(-3-√2)/7
x₂=(-3+√2)/7
1) кубический корень 81 = 81 ^ 1/3 = ( 3^4 ) ^ 1/3 = 3 ^ 4/3
2) ( 3 ^ 4/3 ) : ( 3 ^ 2/3 ) = 3 ^ ( ( 4/3 ) -( 2/3 ) ) = 3 ^ 2/3
Ответ 3 ^ 2/3