1.
如图,A,B,C,D是⊙O的四等分点,点P是劣弧$\widehat{AB}$上的动点,当点P从点A向点B运动时(点P不与A、B重合).若⊙O的半径为2.则图中阴影部分面积的最大值是( )
| A. | $\sqrt{2}$ | B. | 2 | C. | 2$\sqrt{2}$ | D. | 2$\sqrt{2}$+2 |
19.在二元一次方程:2x-3y=5中,用x表示y正确的是( )
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| A. | 2x=5+3y | B. | 3y=5-2x | C. | x=$\frac{3y+5}{2}$ | D. | y=$\frac{2x-5}{3}$ |