Question

计算(—3ab)(2a²—1/3ab+5b²)

Answer 1

(-3ab)(2a²-1/3ab+5b²)
=(-3ab)*2a²-(-3ab)*1/3ab+(-3ab)*5b²
=-6a³b+a²族则b²-15ab³兆颤棚洞悉

Answer 2

(—3ab)(2a²—1/3ab+5b²)

=-6a^3b+a^2b^2-15ab^3

追问

能计算这个吗？(a+1/3)(a-1/4)

追答

(a+1/3)(a-1/4)

=a^2-a/4+a/3-1/12
=a^2+a/12-1/12