Câu hỏi:
What four digit positive, whole number has its last and first digits equal, addition of its last two digits is equal to its second digit. And the product of the squares of its last two digits is equal to four two noughts.
Đáp án:
5945. 5=5. 4+5=9=second digit 4^2 x 5^2 = 400 = four two noughts
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