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OpenStudy (anonymous):
8/9-(-1/2)
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OpenStudy (bahrom7893):
8/9+1/2
OpenStudy (anonymous):
8/9+1/2 =(8*2+1*9)/18 = 25/18
OpenStudy (callisto):
8/9-(-1/2) = 8/9 +(1/2) = (8x2)/(9x2) + (9x1)/(2x9) = 16/18 + 9/18 = 25/18
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