1) (7-(-3.5))(7+(-3.5))+((-3.5)+3)²=
=(7+3.5)(7-3.5)+(-0.5)²=37
2(x-2)(x+2)-(x-1)²=x²-5
1) (x-1)²=(x-1)(x-1)=x²-x-x+1=x²-2x+1
2) (x-2)(x-2)=x²-2x-2x+4=x²-4x+4
3) 2(x²-4x+4)=2x²-8x+8
2x²-8x+8-x²+4x-4-x²+5=0
-4x+9=0
-4x=-9
x=-9/(-4)=2.25
1).25а^3 - аb^2 = a(25a^2 - b^2) = a(5a-b)(5a+b)
2).-3х^2 - 12х-12 = -3(x^2 + 4x + 4) = -3(x+2)^2
3).3ab-15a+12b-60 = 3a(b-5) + 12(b-5) = (b-5)(3a+12)
4).a^4 - 625
= a^4 - 5^4 = (a^2)^2 - (5^2)^2 = (a^2 - 5^2)(a^2+5^2)
Расположено между 23 и 24