你能帮帮他们吗
求回答!动点P是曲线y=2x^2+1上任意一点,定点A(0,-1),点M分PA所成的比为2:1则点M的轨迹方程是
1年前
I agree with you and hope that you have a happy life!
1年前
(2007•南京一模)如右图所示,用轻弹簧相连的质量均为2kg的A、B两物块都以v=6m/s的速度在光滑水平地面上运动,
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英语翻译She & Him - Me And You Well I'm back in your good graces
1年前
She pretended to be friendly_____nothing had happened betwee
1年前