15.在平面直角坐标系内点(x,y)满足x=y2,则点(x,y)位于( )
| A. | x轴上方(含x轴) | B. | x轴下方(含x轴) | C. | y轴右方(含y轴) | D. | y轴左方(含y轴) |
7.△ABC∽△A1B1C1,相似比为$\frac{1}{3}$,△A1B1C1∽△A2B2C2,相似比为$\frac{4}{3}$,则△ABC∽△A2B2C2,其相似比为$\frac{4}{9}$.
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