有5条交*的路，要把10盏灯安装在路上，使每条路上安装4盏灯，该怎样安装？画图试一试．
口算下面各题．÷8=×= 5÷= 3+3÷7=×15= 10÷10%= 28×75%=×8×=
直接写出得数．×16=+= 0÷=÷3=÷= 7﹣=×= 8÷=
直接写出得数． 6÷=×= 0÷= 4.1﹣÷=﹣=÷=×8×=化简比0.6：=
直接写出得数．×=×4=×=×= 3×=÷2==×= 12=﹣1÷2=
直接写出得数．×=÷=÷26====×÷=== 1.2÷=
÷8=
×
= 5÷
= 3+3÷7=
×15= 10÷10%= 28×75%=
×8×
=
×16=
+
= 0÷
=
÷3=
÷
= 7﹣
=
×
= 8÷
=
=
×
= 0÷
= 4.1﹣
÷
=
÷
=
×8×
=化简比0.6：
=
×
=
×4=
×
×
= 3×
=
÷2=
=
×
= 12
=
﹣1÷2=
×
=
÷
÷26=
=
=
=
×
÷
=
=
= 1.2÷
=
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