D29MW-Q86CK-88JFH-RV7WB-F4VXT
VJ72Q-PCJGM-PD2BG-3JY7T-7B4WG
Q6VQ9-B79JX-CYWPG-7TQJ9-27B7Y
QRD63-D7HQ6-2T2WY-B6C4K-QD493
HQYRK-V7DKP-9H79Y-XMTY8-J9XRB
KMFFT-YWF9Y-DJ2HJ-3H2BQ-RH3QB
P9KCT-QVXVQ-8HBC7-VD3TT-VDQJJ
FMHGF-2H8MH-X2R37-YJ23W-W4CFG
主要参数
投影距离：1-12 纠错；
投影尺寸：23-300英寸 纠错；
屏幕比例：4:3/16:9 纠错；
色彩数目：1677万 纠错；
梯形校正：垂直梯形失真校正 纠错；
投影方式：正/背投, 桌上/吊挂 纠错；
接口参数 输入端子：VGA输入:迷你D-Sub 15针×1；
S-Video；
复合视频RCA；
RGB Audio:Stereo Mini jack×1 纠错；
输出端子：VGA输出:迷你D-Sub 15针×1；
音频Stereo Mini jack×1；
第二秒内的平均速度应该等于第 1秒末到第 2秒末之间的位移差。
因为：r1 = 6t² - 2t³ = 6 1² - 2 1³ = 4(m)
r2 = 6t² - 2t³ = 6 2² - 2 2³ = 8(m)
所以，平均速度 v = (r2 - r1)/(2 - 1) = 4(m/s)
第 3 秒末的速度 v = dr/dt = 12t - 6t² = -18(m/s)，它的加速度 a = dv/dt = 12 - 12t = -24(m/s²)
第 4 秒末的速度 v = dr/dt = 12t - 6t² = -48(m/s)，它的加速度 a = dv/dt = 12 - 12t = -36(m/s²)
r=2ti+(2-t^2)j (1)
v=dr/dt=2i+-2tj ，(2)
合速度大小v=√(2^2+(-2t)^2)=2√(1+t^2) ,(3)
合加速度 a=dv/dt=-2j ,(4)
切向加速度大小：对(3)式求导
at=dv/dt=d(2√(1+t^2))/dt=2(1/2)(2t)/√(1+t^2)=2t/√(1+t^2) ,(5)
向心加速度大小： an=√(a^2-at^2)=√((-2)^2-(2t/√(1+t^2))^2)=2√(1/(1+t^2)) (6)
将t=1s和t=2s 分别代入 (3)、(5)、(6)式，可得：合速度大小v、切向加速度大小at和向心加速度大小an。
你去看看吧 http://wwwos8cn/ViewInfoaspid=1197
Windows XP PRO build 2600 or XP pro 2600
evaluation:
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CVB8P-QXQ3X-DD3JF-2YXC6-7HR3H
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Q7Q3F-7VPFF-WPWY2-CGWXX-PGF6Q
r^2=x^2+y^2
=(2t+5)^2+(t^2+3t-4)^2
=t^4+6t^3+5t^2-4t+41
r=(t^4+6t^3+5t^2-4t+41)^(1/2)
链法则
dr/dt=(1/2)(t^4+6t^3+5t^2-4t+41)^(-1/2) (t^4+6t^3+5t^2-4t+41)'
=(2t^3+9t^2+5t-2)/根号(t^4+6t^3+5t^2-4t+41)
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