(a+b)²=a³+3a²b+3ab²+b³
(a-b)³=a³-3a²b+3ab²-b³
(4а+1/3 b)³=64a³ + 3*16a² *1/3 b + 3*4a * 1/9b² + 1/27b³=64a³ + 16a²b + 4/3 ab² + 1/27 b³
(2x-1/2y)³=8x³ - 2x²y +1/2 ay² - 1/8 y³
(2/3 x - 3y)³=8/27 x³ - 4/3 x²y+6xy² - 27y³
(1/3 m+1/2 n)³=1/27 m³+1/18 m²n+1/12 mn²+1/8 n³
(1/5 a+5b)³=1/125 a³ +1/5 a²b+5ab²+125b³