(5/12-1/4)/9/4 2/3-(2/3-1/2)

(5/12-1/4)/9/4 2/3-(2/3-1/2)
(5/12-1/4)/9/4 2/3-(2/3-1/2)

(5/12-1/4)/9/4 2/3-(2/3-1/2)
(5/12-1/4)/9/4
=1/6÷9/4
=2/27
2/3-(2/3-1/2)
=2/3-2/3+1/2
=1/2
请好评

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