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Unaudited Interim Condensed Consolidated Statements Of Comprehensive Income In Thousands, except Share data, unless otherwise specified | 9 Months Ended
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Sep. 30, 2012 USD ($) | Sep. 30, 2012 CNY | Sep. 30, 2011 CNY | Sep. 30, 2012 Common Class A and Class B USD ($) | Sep. 30, 2012 Common Class A and Class B CNY | Sep. 30, 2011 Common Class A and Class B CNY | Sep. 30, 2012 Class A Ordinary Shares American Depositary Shares USD ($) | Sep. 30, 2012 Class A Ordinary Shares American Depositary Shares CNY | Sep. 30, 2011 Class A Ordinary Shares American Depositary Shares CNY
Revenues: |  |  |  |  |  |  |  |  |
Online marketing services | $ 2,539,157 | 15,958,094 | 10,023,103 |  |  |  |  |  |
Other services | 2,002 | 12,585 | 3,590 |  |  |  |  |  |
Total revenues | 2,541,159 | 15,970,679 | 10,026,693 |  |  |  |  |  |
Operating costs and expenses: |  |  |  |  |  |  |  |  |
Cost of revenues | (708,890) | (4,455,230) | (2,656,295) |  |  |  |  |  |
Selling, general and administrative | (271,920) | (1,708,963) | (1,170,360) |  |  |  |  |  |
Research and development | (255,100) | (1,603,252) | (920,656) |  |  |  |  |  |
Total operating costs and expenses | (1,235,910) | (7,767,445) | (4,747,311) |  |  |  |  |  |
Operating profit | 1,305,249 | 8,203,234 | 5,279,382 |  |  |  |  |  |
Other income: |  |  |  |  |  |  |  |  |
Interest income | 97,682 | 613,909 | 259,211 |  |  |  |  |  |
Interest expense | (11,909) | (74,845) | (56,637) |  |  |  |  |  |
Foreign exchange loss, net | (239) | (1,505) | (4,333) |  |  |  |  |  |
Loss from equity method investments | (27,449) | (172,511) | (171,614) |  |  |  |  |  |
Other income, net | 11,731 | 73,727 | 57,193 |  |  |  |  |  |
Total other income | 69,816 | 438,775 | 83,820 |  |  |  |  |  |
Income before income taxes | 1,375,065 | 8,642,009 | 5,363,202 |  |  |  |  |  |
Income taxes | (164,564) | (1,034,250) | (784,369) |  |  |  |  |  |
Net income | 1,210,501 | 7,607,759 | 4,578,833 |  |  |  |  |  |
Net loss attributable to noncontrolling interests | (8,399) | (52,787) | (6,134) |  |  |  |  |  |
Net income attributable to Baidu, Inc. | 1,218,900 | 7,660,546 | 4,584,967 |  |  |  |  |  |
Net income attributable to Baidu, Inc. - Basic |  |  |  | $ 34.79 | 218.66 | 131.43 | $ 3.48 | 21.87 | 13.14
Net income attributable to Baidu, Inc. - Diluted |  |  |  | $ 34.75 | 218.38 | 131.14 | $ 3.48 | 21.84 | 13.11
Weighted average number of Class A and Class B ordinary shares outstanding |  |  |  |  |  |  |  |  |
Basic |  |  |  | 34,932,111 | 34,932,111 | 34,884,109 |  |  |
Diluted |  |  |  | 34,978,241 | 34,978,241 | 34,961,580 |  |  |
Other comprehensive income, net of tax |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | (434) | (2,726) | 16,917 |  |  |  |  |  |
Unrealized gains on available-for-sale securities | 1,870 | 11,752 | 0 |  |  |  |  |  |
Other comprehensive income, net of tax | 1,436 | 9,026 | 16,917 |  |  |  |  |  |
Comprehensive income | 1,211,937 | 7,616,785 | 4,595,750 |  |  |  |  |  |
Comprehensive loss attributable to noncontrolling interests | (8,478) | (53,284) | (6,134) |  |  |  |  |  |
Comprehensive income attributable to Baidu, Inc. | $ 1,220,415 | 7,670,069 | 4,601,884 |  |  |  |  |  |

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