1.
-8x²-16xy-8y²=-8(x²+2xy+y²)=-8(x+y)²
2.
5mn+15m-10n-30=5m(n+3)-10(n+3)=(n+3)(5m-10)
3.
256-b^4=16²-(b²)²=(16-b²)(16+b²)
№134.
г) √(7² - 26:2) = √(49 - 13) =√36 = √6² = 6
д) ¹/₃ * √(5² + 22:2) = ¹/₃ * √(25 +11) = ¹/₃ * √36 = ¹/₃ * 6 = 2
е) 3√0,64 -5√1,21 = 3√0,8² - 5√1,1² = 3*0,8 - 5*1,1 =2,4 - 5,5 = -3,1
1) xy=4•1.
2)x-2y=4-2•2=4-2=2
3)4+2•1=6