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计算：1000001×999999=？a、9

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计算：1000001×999999=？
a、999999999999
b、9999999999
c、99999999999
d、999999999990

参考答案:

A =999999000000+999999=999999999999

（1000000+1）×999999

=999999000000+999999=999999999999

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