1.计算(-2x^2y)^2.2.一个长方形面积是(x^2-81)cm^2,宽为x-9,那么长是____;3.已知点A(1,3)B(4,6),p为x轴上点,要使得PA+PB值最小则p坐标为____.
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![1.计算(-2x^2y)^2.2.一个长方形面积是(x^2-81)cm^2,宽为x-9,那么长是____;3.已知点A(1,3)B(4,6),p为x轴上点,要使得PA+PB值最小则p坐标为____.](/uploads/image/z/6902970-42-0.jpg?t=1.%E8%AE%A1%E7%AE%97%28-2x%5E2y%29%5E2.2.%E4%B8%80%E4%B8%AA%E9%95%BF%E6%96%B9%E5%BD%A2%E9%9D%A2%E7%A7%AF%E6%98%AF%28x%5E2-81%29cm%5E2%2C%E5%AE%BD%E4%B8%BAx-9%2C%E9%82%A3%E4%B9%88%E9%95%BF%E6%98%AF____%EF%BC%9B3.%E5%B7%B2%E7%9F%A5%E7%82%B9A%281%2C3%29B%284%2C6%29%2Cp%E4%B8%BAx%E8%BD%B4%E4%B8%8A%E7%82%B9%2C%E8%A6%81%E4%BD%BF%E5%BE%97PA%2BPB%E5%80%BC%E6%9C%80%E5%B0%8F%E5%88%99p%E5%9D%90%E6%A0%87%E4%B8%BA____.)
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