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Calculati:a) (7/9+17/6)-(5/6-1/18);b) (17/24+5/36)-(5/60-1/18);c) (4 7/9-1 1/2)-(15/26-1/24);d) (7/9+17/10-1/18)-(13/27-1/18);e) (13/63+17/45)-(5/36-1/27);f) (7/16+17/5-1/40)-(5/8-3/5).