共50条信息
已知实数对\((x,y)\),设映射\(f:(x,y)\to (\dfrac{x+y}{2},\dfrac{x-y}{2})\),并定义\(|(x,y)|=\sqrt{{{x}^{2}}+{{y}^{2}}}\),若\(|f\left[ f(f(x,y)) \right]|=4\),则\(|(x,y)|\)的值为\((\) \()\)
已知集合\(P=\left\{a,b,c\right\},Q=\left\{-1,0,1\right\}, \)映射\(f:P→Q \)满足\(f(b)=0 \)的映射的个数共有 个
在平面直角坐标系\(xOy\)中,\(A(-1,0)\),\(B(0,1)\),\(C(1,0)\)映射\(f\)将\(xOy\)平面上的点\(P(x,y)\)对应到另一个平面直角坐标系\(u{O}{{{"}}}v\)上的点\({P}{{{"}}}(4xy,2{{x}^{2}}-2{{y}^{2}})\),则当点\(P\)沿着 折线\(A-B-C\)运动时,在映射\(f\)的作用下,动点\({P}{{{"}}}\)的轨迹是 \((\) \()\)
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