1:)which of the following represents the number of different colors can be arranged in 4 vertical stripes on a flag?2:)what is the product of the two complex number (2-3i)and (2+3i)?
热心网友
:以下各项中的哪一个描述不同颜色的数量可以被在一个标志上用4个垂直的条纹安排（似乎无法理解）:两个复数2-3i和2+3i的乘积是什么？