请学霸们帮我解答这道题目的全过程，拜托

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 激芦耐明春哗旦

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(1)399.6*9-1998*0.8=2000-2=1998
(2)0.1992*20142014-0.2014*19921992=0
(3)(33221-332.21)+(66442-664.42)=99663-996.63=93666.37

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1998 0 93666.37

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1998 0 93666 .73

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采纳秒回

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 族碧卖兆逗慧旅

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