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1/2×4/5×2/3= 8/30
21×2/9×3/2×1/2×5/7= 630/252= 90/36
Convertimos a fracción común:
90/36= (90×5)/(36×5)= 450/180
8/30= (8×6)/(30×6)= 48/180
90/36-8/30= 450/180-48/180= 402/180
402/180= 67/30
R. Le falta 67/30