(ab-4)(a²b²+4ab+4²)=a³b³-4³=a³b³-64
2y - xy² + 6xy - 3x²y² = (2y - xy²) + (6xy - 3x²y²) = y(2-xy) + 3xy(2-xy) =
= (2-ху)(у+3ху)
3x-pi/4=+-pi/3+2pi*n, n€z
3x-pi/4=pi/3+2pi*n
x=(7pi+24pi*n)/36
при n=1:
X=31pi/36
1) -(a-b)= -a+b
2) -(2a+3c-4b)= -2a-3c+4b
3) -(2-a-4n)= -2+a+4n
4) -2(3+2c)= -6-4c
5) -3(4c-2a)= -12c+6a
6) 5(4-2c)= 20-10c
7) -2(3-3n+4m)= -6+6n-8m
8) -4(a-4c+6d-n)= -4a+16c-24d+4n