如图，将正方形ABCD的一角折叠，折痕为AE，∠BAD比大∠BAE大48°．设∠BAD和∠BAE的度数分别为x、y，那么x、y所适合的一个方程组是

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如图，将正方形ABCD的一角折叠，折痕为AE，∠BAD比大∠BAE大48°．设∠BAD和∠BAE的度数分别为x、y，那么x、y所适合的一个方程组是（　　）

A： $\{\begin{matrix} y - x = 48 \\ y + x = 90 \end{matrix}$

B： $\{\begin{matrix} y - x = 48 \\ y = 2 x \end{matrix}$

C： $\{\begin{matrix} y - x = 48 \\ y + 2 x = 90 \end{matrix}$

D： $\{\begin{matrix} x - y = 48 \\ x + 2 y = 90 \end{matrix}$

上一题下一题 0.0难度选择题更新时间:2016-09-01 06:49:11

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D

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