(90+1/88)*1/89= 13又4/11-(2又2/3-7/11)

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(90+1/88)*1/89= 13又4/11-(2又2/3-7/11)
(90+1/88)*1/89= 13又4/11-(2又2/3-7/11)

(90+1/88)*1/89= 13又4/11-(2又2/3-7/11)
1
=(89+1+1/88)*1/89=1+89/88*1/89=1+1/88=89/88
2
= 13又4/11-2又2/3+7/11=14- 2又2/3=11又1/3

2
10 2/33