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How to write 20 1 1 Fujian liberal arts mathematics college entrance examination 18?
Hehe, I just looked at it. I am a science student in Fujian this year.

The first problem should be possible, that is, solve an equation about X at the same time, and then make △=0 to find the value of B.

The second question, on the basis of the first question, calculates the value of B, then calculates the coordinates of A, and writes the quasi-realistic equation of parabola, so that the required equation can be written.

I hope I can help you. .