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Senior three math problems ~! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
Let x in f(x) be equal to 4, substitute and solve. When the sum of 4 is a period and the value of x in f(x) is equal to 8, f (8) = 31; Add high scores; Don't enter the wrong classification, which is the key to getting extra points.

Well, I understand that you didn't untie the team until the step is |4-m|=|8-m|, and you can get it; Remember to add high marks, and pay attention to the values when you are finished.