(4 13/18-3 7 /9)*(1/2-4/17)

(4 13/18-3 7 /9)*(1/2-4/17)
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(4 13/18-3 7 /9)*(1/2-4/17) = 19/68                                                               13*1 - 7*2 (4 13/18-3 7 /9) = (4-3)+(13/18-7/9)= 1 + ------------------------ = 1+1/18= 1 1/18                                                                      18                         1*17 - 4*2                   17 - 8              9 (1/2-4/17) = ----------------------------- = ------------------- = -------------                                34                         34               34 1 1/18 * 9/34 = 19/18 * 9/34 = 19/68
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