题10: 21.$\Delta ABC$中,$\angle C=90\circ$,$\angle A=60\circ$,$AB=2$,$M$为$AB$中点,将$\Delt
基础fill_compute
题13: 22.平面与平面垂直的判定定理符号语言为:___$a\sub \alpha$[,]$a\bot \beta \Rightarrow \alpha \bot \b
基础fill_compute
题24: 25.在长方体$ABCD-A_{1}B_{1}C_{1}D_{1}$中,$DD_{1}=2AB=2BC=2$,动点$P$满足$\frac{{D_1}P}{{D_
简单fill_compute