问题描述:
如图15,在平面直角坐标系中,点P从原点O出发,沿x轴向右以每秒1个单位长的速度运动t(t>0)秒,
②S=S四边形AMNP-S△PAM=S△DPN+S梯形NDAM-S△PAM
= 1/2(t-4)(4t-16)+ 1/2[(4t-16)+(t-1)]×3- 1/2(t-1)(t-1)
中为什么是【(4t-16)】?
②S=S四边形AMNP-S△PAM=S△DPN+S梯形NDAM-S△PAM
= 1/2(t-4)(4t-16)+ 1/2[(4t-16)+(t-1)]×3- 1/2(t-1)(t-1)
中为什么是【(4t-16)】?
问题解答:
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