√27·⁵√243 -3¹/² =√27·(3⁵)¹/⁵ -3¹/²=3√3·3 -√3=√3(9-1)=8√3;
[3^(-5/3)·81^(3/4)]/∛3=3^(-5/3-1/3)·(3⁴)^(3/4)=3^(-5/3-1/3+3·4/4)=
=3^(-2+3)=3¹=3;
(5-t)(-t-5)-(4+t)² = (-t)²-25-(16+8t+t²) = (-t)²-25-16-8t-t² = - 41 - 8t
1) х не равно -2 и 1.
4+2х=3-3х , 5х=-1 х=-0,2
2) 2х(х+1,5)=0 х=0, х=-1,5
3) 8-0,4х=23-0,2х+9
-24=0,2х
-48=х