問(wèn)答題在拋物線y=x2上取橫坐標(biāo)為x1=1及x2=3的兩點(diǎn),作過(guò)這兩點(diǎn)的割線、問(wèn)該拋物線上哪一點(diǎn)的切線平行于這條割線?

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