(x-2)(x-9)>=0
x (-inf; 2] u [9;+inf)
В3) (2а^3 - а+3)-(а^3 - а-1)=2а^3-а+3-а^3+а+1=а^3 +4
В4) (х+1)(-х^2+х+3)=-х^3 - х^2 +х^2 + х +3х+4=-х^3 +4х+4
В5) =х^2 - х-2х+2+3х^2-х=4х^2 - 4х +2
408
1) (6xy-1)(6xy+1)
2)(xy^2-4)(xy^2+4)
3)(9a^3-7b^2)(9a^3+7b^2
4)(5a-3b^3)(5a+3b^3)
409
1) (a^2-b^2)(a^2+b^2)или (a-b)(a+b)(a+b)(a+b)
2) (a^2-b^4)(a^2+b^4)
410
1) (a+b-c)(a+b+c)
2)(m-n-k)(m-n+k)
3)(2b-8a)(2b+10a)
4)(3x-5y)(3x+3y)
(5x-1)(x+2)+3(x-4)(x+4)=2(2x+3)²-8
5x²+10x-x-2+3(x²-16)=2(4x²+12x+9)-8
5x²+9x-2+3x²-48=8x²+24x+18-8
8x²+9x-50=8x²+24x+10
8x²-8x²+9x-24x=10+50
-15x=60
x=-4
A(t)=s''(t)
s''(t)=((2/3)*t³-2t²+4t)''=((2/3)*3t²-2*2t+4)'=(2t²-4t+4)'=4t-4
a(t)=4t-4
a(10)=4*10-4=36
a(10)=36 м/c²