2.3d㎡=0.023㎡
1.3dm=0.013m
1.9dm=0.019m
h=2S÷﹙a﹢b﹚
=0.023×2÷(0.013﹢0.019﹚
=0.046÷0.032
=1.4375m
答:它的高是1.4375m.