答案:1.75-(2/5 1/3)X45 = 75-2/5x 45-1/3x 45 = 75-18-15 = 75-15-18 = 60-18 = 42；2.(9.3x 5/6-7.3)9/4 = 7.75-7.3 2.25 = 7.75 2.25-7.3 = 10-7.3 = 2.7 .完成回答。
