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99X999简便

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

参考

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

答案如下

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

99x999x9999 =(100-1)(1000-1)(10000-1) =(100000-1000-100+1)(10000-1) =1000000000-10000000-1000000+10000-100000+1000+100-1 =988911099 加油!不懂的话再问,诚答!

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

99x999十199 =99x999十99+100 =99×(999+1)+100 =99x1000十100 =99000+100 =99100 您好,答题不易 如有帮助请采纳,谢谢

9×99+9 =9×99+9×1 =9×(99+1) =9×100 =900

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