作业帮99乘999999等于
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99乘999999等于
99乘999999等于
99乘999999等于
99乘999999
=99×(1000000-1)
=99×1000000-99
=99000000-99
=98999901
=98999901
= (100-1)(1000000-1)
= 100000000 - 1000000 - 100 + 1
= 98999901
98999901
=(100-1)*999999
98999901
98999901
98999901