(5/12-1/4)/9/4 2/3-(2/3-1/2)
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![(5/12-1/4)/9/4 2/3-(2/3-1/2)](/uploads/image/z/9612604-28-4.jpg?t=%285%2F12-1%2F4%29%2F9%2F4+2%2F3-%282%2F3-1%2F2%29)
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(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
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