Simplify 67 × 66 / 65, 12 / 5 / 9 + 12 / 5 / 8 / 9
=(66+1)*(65/66)
=65+(65/66)
=65 and 66 out of 65
=(5/12)*(1/9)+(5/12)*(8/9)
=(5/12)*1
=5/12
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