It reads your mind! How could it be? Can you figure this out?
海外博客
誰能知道你在想什麽
Flamenco_Girl 發表評論於
Good job Mellow!
Mellow 發表評論於
Assumption：十位數數字為b，個位數數字為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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