20:( )=0.125=4/()=():8

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20:( )=0.125=4/()=():8

20:( )=0.125=4/()=():8
20:( )=0.125=4/()=():8

20:( )=0.125=4/()=():8
0.125可以化为1/8
∴20:(160 )=0.125=4/(32)=(1):8

20:( 160)=0.125=4/(32)=(1):8

20:(160 )=0.125=4/(32)=(1):8