英语翻译In the xy-coordinate plane,P and Q are different points that have the same y-coordinate and lie on the parabola whose equation is y=x^2-3x-40.What is the x-coordinate of the midpoint of PQ?
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![英语翻译In the xy-coordinate plane,P and Q are different points that have the same y-coordinate and lie on the parabola whose equation is y=x^2-3x-40.What is the x-coordinate of the midpoint of PQ?](/uploads/image/z/12795692-68-2.jpg?t=%E8%8B%B1%E8%AF%AD%E7%BF%BB%E8%AF%91In+the+xy-coordinate+plane%2CP+and+Q+are+different+points+that+have+the+same+y-coordinate+and+lie+on+the+parabola+whose+equation+is+y%3Dx%5E2-3x-40.What+is+the+x-coordinate+of+the+midpoint+of+PQ%3F)
英语翻译In the xy-coordinate plane,P and Q are different points that have the same y-coordinate and lie on the parabola whose equation is y=x^2-3x-40.What is the x-coordinate of the midpoint of PQ?
英语翻译
In the xy-coordinate plane,P and Q are different points that have the same y-coordinate and lie on the parabola whose equation is y=x^2-3x-40.What is the x-coordinate of the midpoint of PQ?
英语翻译In the xy-coordinate plane,P and Q are different points that have the same y-coordinate and lie on the parabola whose equation is y=x^2-3x-40.What is the x-coordinate of the midpoint of PQ?
在xy平面里,P、Q为纵坐标相同的两点,并且P、Q两点在抛物线y=x^2-3x-40上.求线段PQ中点的横坐标.
自己参考吧:Xm=1/2(Xp+XQ).利用抛物线的symmetry(对称性),Xm=1/2*2*[-(-3/2)]=1.5
在xy座标平面上, P和Q是两个不相同的点,但有著相同的Y座标,并且同样处於等式y=x^2-3x-40的parabola(就是那个U型的线,中文不知道叫甚麼不好意思。)上面。请问PQ中间点的X座标是甚麼?