It reads your mind! How could it be? Can you figure this out?
海外博客
谁能知道你在想什么
Flamenco_Girl 发表评论于
Good job Mellow!
Mellow 发表评论于
Assumption：十位数数字为b，个位数数字为a
Formula：10b+a-（b+a）=10b-b=9b
See the chart，the signs beside the numbers which are multiplication （1 to 9，whichever you chose for the b）of 9 are the same。
Formula：10b+a-（b+a）=10b-b=9b
See the chart，the signs beside the numbers which are multiplication （1 to 9，whichever you chose for the b）of 9 are the same。
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