计算有理数混合运算

题目

计算有理数混合运算
[(-3)³-(-5)³]÷[(-3)-(-5)]
答案是49吗?

答案

[(-3)³-(-5)³]÷[(-3)-(-5)]
=[-27-(-125)]÷[(-3)+5]
=98÷2
=49