1.(х-4)2=х2-2•4•х+16
(3х-5)2=9х2-2•3•5+25
(2а-3)(2а+3)= 4а2-9
(у2-2)(у2+2)=у4-4
2.b2-0,36=(b-0,6)(b+0,6)
y-6y+9=(y-3)2
3.(2a-3b)3b+(a-3b)2. при а=2/7
6аb-9b2+a2-6ab+9b2=a2 =(2/7)2=4/49
4. 5(2-3xy)(2+3xy)=5(4-9x2y2)=20-45x2y2
(a3-b2)2=a6-2a3b2+b4
(x+y)2-(x-y)2=x2+2xy+y2-x2+2xy-y2=4xy
5. (6a-1)(6a+1)-4a(9a+2)=-1
36a2-1-36a2-8a=-1
-8a=-1+1
-8a=0. a=0
6. (2x+3)(3x-7)-(x+1)(x-1)
6x2-14x+9x-21-x2+1=5x2-5x-20=5(x2-x-5)
ответ Да