如图，依次排列的5个数是13，12，15，25，20．它们每相邻的两个数相乘得4个数．这4个数每相邻的两个数相乘得3个数．这3个数每相邻的两个数相乘得2个数．这2个数相乘得1个数．请问：最后这个数从个位起向左数，可以连续地数出几个零?
直接写出得数= = = = +== = 1÷= = =
直接写出得数．×16= 10÷= 12÷=×= ×= ÷3=×= ×=
6×= += ×= 3﹣= ÷=1÷= ÷= ﹣= ×14= ÷12=
直接写出得数．= = 71.83÷8≈ 5.04×9.85≈= = = 0.53=
直接写得数= = = = == = 60×60%= 2×32= =
= 
= 
= 
= 
+
=
= 
= 1÷
= 
= 
=
×16= 10÷
= 12÷
=
×
= 
×
= 
÷3=
×
= 
×
=
= 
+
= 
×
= 3﹣
= 
÷
=
= 
÷
= 
﹣
= 
×14= 
÷12=
= 
= 71.83÷8≈ 5.04×9.85≈
= 
= 
= 0.53=
= 
= 
= 
= 
=
= 
= 60×60%= 2×32= 
=
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