已知ξ~B(n,p),Eξ=3,D(2ξ+1)=9,则P的值是____
—Maybe next Friday. I have time to relax then.
计算:﹣32÷3×1tan60°+|2﹣3|
男生人数比女生人数多 15 ,把女生人数看作单位“1”.(判断对错)