99又99分之98乘99
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99又99分之98乘99
99又99分之98乘99
=(99+98/99)×99
=99×99+98/99×99
=99×99+98
=99×99+99-1
=99×(99+1)-1
=9900-1
=9899
=(99+98/99)×99
=99×99+98/99×99
=99×99+98
=99×99+99-1
=99×(99+1)-1
=9900-1
=9899