梯形的面积是759平方米,下底长45米,高是23米,则上底是多少米?;};C2F.i2g9U5M9O5@
算式:提示3P5w0i3u,y*h;c+z6q3R*V9};};C2F.i2g9U5M9O5@
答:上底是9v3u+H*|6L7x米。;};C2F.i2g9U5M9O5@