简算13又 1/5*5/6+28又 2/7*7/9.....
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简算13又 1/5*5/6+28又 2/7*7/9.....
简算13又 1/5*5/6+28又 2/7*7/9
.....
简算13又 1/5*5/6+28又 2/7*7/9.....
13又 1/5*5/6+28又 2/7*7/9
=(12+6/5 )x5/6+(27+9/7)x7/9
=10+1+21+1
=33