问题
解答题
化简：（a-b）2+b（2a+b）
答案
原式=a2-2ab+b2+2ab+b2=a2+2b2．
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化简：（a-b）2+b（2a+b）
原式=a2-2ab+b2+2ab+b2=a2+2b2．
An analyst does research about security market indices and gathers the following information about market-capitalization-weighted index consisting of the shares of three companies:
| Company | Beginning Share Prices | Ending Share Prices | Dividends Per Share | Shares Outstanding |
| A | $26 | $21 | $1.60 | 300 |
| B | $51 | $46 | $2.10 | 300 |
| C | $11 | $13 | $3.10 | 400 |
A. -16.55%
B. -8.00%
C. 0.55%