校门口一条长180米的林荫路两侧各栽了一行杨树，起点和终点都栽．共栽了20棵，如果相邻两棵树之间的距离相等，你知道相邻两棵树之间的距离吗？
直接写得数．×0=×=×12=×=÷=÷= 9×=×= 18×=÷=÷=÷12=
计算×÷÷．
直接写出得数．÷5=÷4=÷2=÷3=÷=÷=÷=÷= 1÷= 15÷=÷=÷=×=×=+= 1﹣=
先看清左右两题之间的关系，再写出得数．
======= 1.05×4= 268÷14×0== 306﹣16= 5.1+0.09=
×0=
×
=
×12=
×
=
÷
=
÷
= 9×
=
×
= 18×
=
÷
=
÷
=
÷12=
×
÷
÷
．
÷5=
÷4=
÷2=
÷3=
÷
=
÷
=
÷
÷
=
= 15÷
=
÷
=
÷
=
×
×
=
+
= 1﹣
=
=
=
=
=
=
=
= 1.05×4= 268÷14×0=
= 306﹣16= 5.1+0.09=
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