有一座桥，过桥需要先上坡，再走一段平路，最后下坡，并且上坡、平路及下坡的路程相等.某人骑电动车过桥时，上坡、走平路和下坡的速度分别为11米／秒、22米／秒和33米／秒，求他过桥的平均速度.
直接写出得数．=== 1= 0×==== 20==
直接写出得数：÷=÷3=××=÷2= 6×=×9×= 5÷﹣÷5= 2.7﹣= （1.6+3.2）×0.125=
直接写得数： 12÷=×30=÷= 16×=÷=÷4=÷×1=÷×=÷3=÷6=÷3=÷．
直接写数：==========
直接写得数．×3= 6÷=÷1= 1÷÷=÷= 0.5÷=﹣= 0÷×=
=
=
= 1
= 0×
=
=
=
= 20
=
=
÷
=
÷3=
×
×
=
÷2=
=
×9×
=
﹣
=
=
×30=
÷
= 16×
÷
÷4=
÷
×1=
÷
×
=
÷3=
÷6=
÷3=
÷
．
=
=
=
=
=
=
=
=
=
=
×3= 6÷
=
÷1=
÷
÷
= 0.5÷
=
﹣
=
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