....................................
а - первого
√32 - √128sin²(9π/8) = √32(1 - 2sin²π/8) = √32(cos2π/8) = 4√2*cos(π/4) =
= 4√2*(√2/2) = 4
-6у=17-х
6у=-17+х
5х+-17+х=13
6х=30
х=5
у=-2
<span>3х^5-2х^4-х^3+6х^2-1=3(-2)^5-2(-2)^4-(-2)^3+6(-2)^2-1=3(-32)-2*16-(-8)+6*4-1= -96-32+8+24-1=-= -128+31= -97</span>
1)<span> 1/10 √200</span>=1/10*10<span>√2</span>=<span> √2</span>