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7/4 + 5/2 : 9/8
7/4 + (5/2 × 8/9)
7/4 + 40/18
63/36 + 80/36
143/36
3 35/36
=7/4+(3/2*8/9)
=7/4+4/3
=21+16/12
=73/12
=6 1/12