汽车上山的速度为每小时36千米，行了4小时到达山顶，下山时按原路返回只用了3小时．汽车下山时平均每小时行多少千米？
直接写数对又快． 97﹣28=÷=×=×= 2.5×4=+= 8÷80%=×÷×=
÷2=+= 10÷=×6=×=÷= 9×= 15×（﹣）=
直接写得数=== 15.7+3==== 10+10%= 3﹣3÷5= 0.9×99+0.9=
1﹣65%= 1﹣1÷6= 0.32= 40×5%=+= 25%÷= 1﹣+= 0.125×0.125=
看谁算得快×=×÷×= 0.35×99=÷= 79﹣0.79=+= 10÷1%= 32×1.25%=
÷
=
×
=
×
=
+
= 8÷80%=
=
÷2=
+
= 10÷
=
×6=
×
=
÷
= 9×
= 15×（
﹣
）=
=
=
= 15.7+3=
=
=
= 10+10%= 3﹣3÷5= 0.9×99+0.9=
+
= 25%÷
+
= 0.125×0.125=
×
=
×
÷
×
= 0.35×99=
÷
=
+
= 10÷1%= 32×1.25%=
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