5х^3-5(х+2)(х^2-2х+4) = 5х^3-5(x^3-2x^2+4x+2x^2-4x+8) = <u>5x^3</u>-<u>5x^3</u>+2x^2-4x-2x^2+4x+8 =
<span>5cosx-cosx-8cosx=1;-4cosx=1;Cosx=-(1/4);<span>X=-arccos1/4+2Пn,n принадлежит z</span></span>
=(8u²-16u+u-2)(3u-8)=(8u²-15u-2)(3u-8)=
=24u³-45u²-6u-64u²+120u+16=
=24u³-109u²+114u+16
1) 3(а-1)²+8а=3(а²-2а+1)+8а=3а²-6а+3+8а=3а²+2а+3
2) 9с²-4+6(с-2)²=9с²-4+6(с²-4с+4)=9с²-4+6с²-24с+24=15с²-24с+20
3) 10аb-4(2a-b)²+6b²=10ab-4(4a²-4ab+b²)+6b²=10ab-16a²+16ab-4b²+6b²=-16a²+26ab+2b²
4) 5(3a+7)²=5(9a²+42a+49)=45a²+220a+245
5) (3a-1)(3a+1)-17a²=9a²-1-17a²=-8a²-1
6) 5a(a-b)-3(a+2)(a-2)=5a²-5ab-3(a²-4)=5a²-5ab-3a²+12=2a²-5ab+12
7) 8m(1+2m)-(4m+3)(4m-3)=8m+16m²-(16m²-9)=8m+16m²+16m²+9=32m²+8m+9
8) (6x-1)(6x+1)-4x(9x+2)=36x²-1-36x²-8x=8x-1
9) 9y²-(1+2y)²=9y²-(1+4y+4y²)=9y²-1-4y-4y²=5y²-4y-1
10) (4-11m)²-1=16-88m+121m²-1=121m²-88m+15