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= 4/9 - 9/4 + 6/1
= 16/36 - 81/36 + 216/36
= 313/36 = 8 28/36
2.7 2/5 × 4 1/3 ÷ 4 1/2
= 37/5 × 13/3 ÷ 9/2
= 37/5 × 13/3 ÷ 2/9
= 37/5 × 13/3
= 481/5 ÷ 2/9
= 1062/45 = 23 27/45