10/9/(18*15/4-5/4)怎樣簡算

10/9/(18*15/4-5/4)怎樣簡算

10/9/(18*15/4-5/4)
=10/9÷【5/4*(18x3-1)】
=10/9x4/5x1/53
=8/9x1/53
=8/477
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