有一根电线，第一次用去了4m，又用去余下的一半；第二次用去了5m，又用去余下的一半，最后还剩下6m．问这根电线原来有多少米？
①= ②= ③= ④= ⑤= ⑥= ⑦= ⑧= ⑨= ⑩= ．
直接写出得数．+= ﹣= 3×= ÷=+= ÷= 1﹣= ×=
直接写出得数．= = = =2÷3= = = =
+= ﹣= ×= 14÷=÷= ×= ÷= 6×=
直接写得数：1﹣= 9×= ÷2= ÷== 1= ×1.3= ×=
= ②
= ③
= ④
= 
= ⑥
= ⑦
= ⑧
= 
= ⑩
= ．
+
= 
﹣
= 
÷
=
+
= 
÷
= 1﹣
= 
×
=
= 
= 
= 
=
= 
= 
=
+
= 
﹣
= 
= 14÷
=
÷
= 
×
= 
÷
= 6×
=
= 9×
= 
÷2= 
÷
= 1
= 
×1.3= 
×
=
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