停车场上停着两轮摩托车和三轮摩托车工23辆，乐乐数了一下，这些摩托车一共有60个轮子，停车场上有三轮摩托车和两轮摩托车个多少辆？
÷×÷× 120÷ 120×÷21×21．
先看清左右两题之间的关系，再写出得数．========
算一算．×3=×4=×2==÷3=÷4=÷2=÷2=
开火车．
直接写得数===== 9×= 0.8﹣==
÷
÷
×
÷21
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=
=
=
=
=
=
=
×3=
×4=
×2=
=
÷3=
÷4=
÷2=
÷2=
=
=
=
=
= 9×
= 0.8﹣
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=
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