问题
选择题
下列运算正确的是（ ）
|
答案
A、错误，∵2a+a=3a；
B、错误，∵
=(-4)×(-9)
×4
，被开方数不能是负数；9
C、错误，∵（3a2）3=27a6；
D、正确，符合底数幂的乘法法则．
故选D．
搜题请搜索小程序“爱下问搜题”
下列运算正确的是（ ）
|
A、错误，∵2a+a=3a；
B、错误，∵
=(-4)×(-9)
×4
，被开方数不能是负数；9
C、错误，∵（3a2）3=27a6；
D、正确，符合底数幂的乘法法则．
故选D．
An analyst does research about book value and gathers the following information from a company's balance sheet (in millions):
| Shareholders' equity | $150 |
| Preferred stock | $25 |
| Total liabilities | $50 |
| Issued common shares | 75 |
| Repurchased common shares | 20 |
A. $1.67
B. $2.27
C. $2.73