“3×10的3次方”用英语怎么读？

“3乘以10的负5次方”
3 multiplied 10 to power minus 5

three times ten to the power of three

3 (three) times 10 (ten) to the 3rd(third) power.

英语中,平方一般称为 x squared
立方可以称为 x cubed 或者按照一般方法
一般方法：x的y次方是 x to the yth power.

Three multiplied by 10 cubed.

the first is right!

the three cubes of ten times three