Metaphor mathematics

A one-month-old boy said to a one-year-old and one-month-old girl, "I love you." The girl said: "We are not suitable, the age difference is too big." The boy said, "No, now your age is 13 times of mine. When I wait for two months, you will be 14 months, and you will be seven times mine. Wait for me. .

Answer seven times in class, math.

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Derive the implicit function of the three high numbers in postgraduate mathematics after class. I first find the derivative of x, and then find the derivative of y in the original formula. The answer

Mathematical Wisdom Tongjiang Su Edition Sixth Grade Answers Volume I Pages 43, 44 and 45!