h=1/2gt1^2t1=根号(2h/g)h=v声t2t2=h/v声t=t1+t2=6根号(2h/g)+h/v声=6根号(2h/10)+h/340=62h/10=(6-h/340)^2h^2-80*340h+36*340^2=0h=170[80±根号6256]=170(80±79.095）h1=153.87,h2=27046.13h2=27046.13不合题意,...