2又5/6*(21除以2又2/7-1/6)除以4/9
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2又5/6*(21除以2又2/7-1/6)除以4/9
=17/6*(21*7/16-1/6)*9/4
=17/6*9/4*433/48
=51/8*433/48
=57又65/128
57又65/128
2又5/6*(21除以2又2/7-1/6)除以4/9
=17/6*(21*7/16-1/6)*9/4
=17/6*9/4*433/48
=51/8*433/48
=57又65/128
57又65/128