Периметр = 34,56*4=138,24
площадь = 34,56*34,56=1194,3936
А)
x²-xy-3x+3y= (x²-3x)+(-xy+3y)= x(x-3) - y(x-3)=(x-y)(x-3)
или
x²-xy-3x+3y=(х²-ху)+(3y-3x)=x(x-y)-(3x-3y)=x(x-y)-3(x-y)= (x-y)(x-3)
б) bx+by-x-y-ax-ay=(bx+by)-(x+y)-(ax+ay)=b(x+y)-(x+y)-a(x+y)=
=(x+y)(b-1-a)
3,68 = 3 68/100 = 3 17/25 = 92/25
12·2³=12·16=192
(4·8)²=32²=1024
1024:16=64
192-64=128