(90+1/88)*1/89
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(90+1/88)*1/89
(90+1/88)*1/89
=(89+1+1/88)*1/88
=(89+89/88)*1/89
=89*1/89+89/88*1*89
=1+1/88
=1又88分之1
=(89+1+1/88)*1/88
=(89+89/88)*1/89
=89*1/89+89/88*1*89
=1+1/88
=1又88分之1