从甲地到乙地原来每隔45米要装一根电线杆，加上两端的两根，一共有53根电线杆，现在改成每隔60米装一根电线杆，除两端的两根不需要移动外，中途还有多少根不必移动？
直接写得数．= = ×30= ÷5= 2÷=470﹣407= 13×50= 8.64﹣5.04= 500÷25= 4.57+5.43=
直接写出得数．= ×4= 0.4÷= 0×1=12×= 5﹣= 4÷= =
直接写得数．+= 20×= 0.36÷0.6= ﹣= ÷2=3.5﹣3.05= ÷= 7×（+）=
直接写出得数．+= ﹣= 12×÷9= ÷3×75= ×14=20÷= ×= 0×3= ÷= ÷=
直接写得数502﹣197= 8.01﹣2.1= 2.5×40= 0.33= 5.2÷0.125÷8== = = = 12.5÷（10%÷10）=
= 
= 
×30= 
÷5= 2÷
=
= 
×4= 0.4÷
= 0×1
=
= 5﹣
= 4÷
= 
=
+
= 20×
= 0.36÷0.6= 
﹣
= 
÷2=
÷
= 7×（
+
）=
+
= 
﹣
= 12×
÷9= 
÷3×75= 
×14=
= 
×
= 0×3= 
÷
÷
= 
= 
= 
= 12.5÷（10%÷10）=
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