(十一又九分之二+九又十一分之二)÷(2/9+2/11)

如题所述

(十一又九分之二+九又十一分之二)÷(2/9+2/11)
=(101/9+101/11)÷(2/9+2/11)
=101(1/9+1/11)÷2(1/9+1/11)
=101/2
=50.5
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