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99X999简便算

99x999+199 =99x999+99+100 =99x(999+1)+100 =99x1000+100 =99000+100 =99100

99X999简便算 =(100-1)*999 =100*999-1*999 =99900-999 =98901

参考

99x999+199 =99x999+99+100 =99x(999+1)+100 =99x1000+100 =99000+100 =99100

99x999+199 =99x999+99+100 =99x(999+1)+100 =99x1000+100 =99000+100 =99100

99x999+999 =(100-1)x999+999 =99900-999+999 =99900

答案如下

99*(1+999)=99*1000=99000

99X999+199 =99X999+100+99 =99X(999+1)+100 =99X1000+100 =99000+100 =99100

99X999 =99x(1000-1) =99x1000-99x1 =99000-99 =98901

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