有一个棱长为20的大立方体，在它的每个角上按如图的方式各做一个小立方体，于是得到8个小立方体．在这些立方体中，上面4个的棱长为12，下面4个的棱长为13．请问：所有这8个小立方体公共部分的体积是多少？
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÷9= 1﹣
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= 3.48+6.52=
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= 0.8﹣
=直接写得数．
2/5﹣1/10= 16÷2/7= 1/2÷3/5= 1/7×1/7= 1/4×2/5=
5/6﹣1/2= 2/7×0+9= 3/5×1/21= 2/7×21= 14/17÷7=
1÷5﹣1/5= 4/7+4/7×6=（1/8+4/8）×4/5= 6×5÷1/2= 1/9÷1/3=
5/9×1/5÷5/9×1/5=
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= 1﹣1%=
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