作业帮9999····99×9999····99 （1994个9×1994个9）求下面两个多位数的乘积的各位数之和.
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9999····99×9999····99 （1994个9×1994个9）求下面两个多位数的乘积的各位数之和.
9999····99×9999····99 （1994个9×1994个9）求下面两个多位数的乘积的各位数之和.
9999····99×9999····99 （1994个9×1994个9）求下面两个多位数的乘积的各位数之和.
原式=1000……（1994个0）×999……（1994个9）-999……（1994个9）=999……（1994个9）000……（1994个0）-999……（1994个0）=999……（1993个9）80000……（1993个0）1各位数字之和=1993×9+8+1
898989898989898989898989....×1994×1994
数学题9+99+999+9999+······+9999·9999(2000个9)
根号下9999····9乘以9999···999+199999··99（都是N个9）结果是多少?
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9999+7778+3333+6666的简便计算快·········急需
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1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
求···············
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9999····99×9999····99 （1994个9×1994个9）求下面两个多位数的乘积的各位数之和.
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