99*99-99巧算

问题描述:

99*99-99巧算

这还能巧算?

99*99-99
=99*(99-1)
=98*99
=98*(100-1)
=9800-98
=9702

99*99-99
=(99-1)x99
=98x99
=(100-1)x98
=98x100-98
=9800-98
=9702

99*99-99
=99*(99-1)
=99*98
=(100-1)*98
=100*98-98
=9800-98
=9702
祝你开心