Ответ:
1
1) (a-2)^2= a^2-4a+4
2) (y+5)^2 = y^2+10y+25
3) (6a-b)(6a+b)= 36a^2-b^2
4) (x^2+2)(x^2-2)= x^4-4
2
1)c^2-0,36= 0,04(5c-3)(5c+3)
2)x^2-8x+16=(x-4)(x-4)
3
(x+4)^2-(x-2)(x+2). При x=0,125
(0,125+4)^2-(0,125-2)(0,125+2)=0,015625+1+16-0,015625-4=13
4
1) 2(4x-2y)(4x+2y)=2(16x^2-4y^2)=32x^2-8y^2
2) (a-3)^2-(a+3)^2=a^2-6a+9-a^2+6a+9=18
3) (7a+2b)^2=49a^2+28ab+4b^2
5
9y^2-25=0
(3y-5)(3y+5)=0
3y-5=0. 3y+5=0
3y=5. 3y= -5
y=1 2/3. y= - 1 2/3