一只蚂蚁沿着一个长15厘米，宽10厘米的长方形的边爬行，它要爬多少厘米才能回到起点？
开火车．
直接写得数= = = == 9×= 0.8﹣= =
× 6×8 +÷ 2.4× 1﹣72%
直接写出得数：0.6÷0.15= ÷100= （+）×63= ﹣0.25=0.5÷= 0.4÷40%= 5.47﹣1.8﹣3.2= 0.42﹣0.32=
直接写得数×0.125= ÷= ÷3+×= 3.6×=÷= 1÷×= 7.9×11﹣7.9= 1.8×4×0.5=
= 
= 
= 
=
= 9×
= 0.8﹣
= 
=
×
6
×8 
+
÷
÷100= （
+
）×63= 
﹣0.25=
= 0.4÷40%= 5.47﹣1.8﹣3.2= 0.42﹣0.32=
×0.125= 
÷
= 
÷3+
×
= 3.6×
=
÷
= 1÷
×
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