99999乘99999等于几?

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99999乘99999等于几?

99999乘99999等于几?
99999乘99999等于几?

99999乘99999等于几?
99999×99999
=(100000-1)(100000-1)
=100000×100000-2×100000+1
=10000000000-200000+1
=9999800001

=(100000-1)*99999
=9999900000-99999
=9999800001