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20 13 how to do the finale problem of mathematics in Shaanxi senior high school entrance examination, and what is the direction of the problem?
Pay attention to some small problems in math 120 (don't lose points on geometry, I missed the third question at the beginning of 1 16. ..............................................................................................................

I feel that the last question is either quadratic function+triangle (trapezoid) or multiple solutions of quadratic function. ?

In fact, luck also accounts for a certain proportion. As for 120, don't force it.