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= 1 1/2 + 2/5 - 3/10 × 1/9
= 3/2 + 2/5 - 3/10 × 1/9
= 3/2 + 2/5 - 3/90
= 3/2 + 2/5 - 1/30
= 45/30 + 12/30 - 1/30
= 56/30
= 28/15
= 1 13/15