[微積] 一道面積題目

[prophet4447 (爺)]

題目是求兩拋物線y=-x^２+２x.    y=x^2-2x-6. 所包圍面積，，，解答是６７÷３    可是我怎樣算都是６７÷４
 救命阿，，，是解答錯還是我錯，，麻煩高人指點一下３q

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