(a的立方-b的立方)+(4ab平方-2a的平方b)-2(ab 的平方-b的立方)
=a³-b³+4ab²-2a²b-2ab²+2b³
=a³+b³-4a²b+4ab²
=(a³+b³)-4(a²b-ab²)
=26-4×(-12)
=26+48
=74
(a的立方-b的立方)+(4ab平方-2a的平方b)-2(ab 的平方-b的立方)
=a³-b³+4ab²-2a²b-2ab²+2b³
=a³+b³-4a²b+4ab²
=(a³+b³)-4(a²b-ab²)
=26-4×(-12)
=26+48
=74