问:

细心算7/9- 2/3+ 2/9 1/2+ 1/3+ 1/4 1/5+3/8+4/54/7+ 2/9-4/7 1- 1/6-5/6 1/5+ 3/8+ 4/5

答:
好的,让我们按步骤详细计算这个复杂的算数问题:
7/9- 2/3 
= 7/9 - 6/9  (因为2/3 = 6/9)
= 1/9
1/9 + 2/9 
= 3/9
3/9 + 1/2
= 3/9 + 9/18   (因为1/2 = 9/18)
= 12/18 + 9/18
= 21/18
21/18 + 1/3
= 21/18 + 6/18   (因为1/3 = 6/18)
= 27/18
27/18 + 1/4
= 27/18 + 9/36   (因为1/4 = 9/36)
= 36/18 + 9/36
= 45/36
45/36 + 1/5
= 45/36 + 12/60   (因为1/5 = 12/60) 
= 57/36 + 12/60
= 513/180
513/180 + 3/8
= 513/180 + 24/40  (因为3/8 = 24/40)
= 537/180 + 24/40
= 837/360 
837/360 + 4/5 
= 837/360 + 16/20  (因为4/5 = 16/20)
= 853/360 + 16/20
= 889/360
889/360 + 2/9
= 889/360 + 4/18    (因为2/9 = 4/18)
= 893/360 + 4/18
= 897/360
897/360 - 4/7
= 897/360 - 28/35   (因为4/7 = 28/35)
= 897/360 - 28/35
= 869/360
869/360 - 1 
= 868/360
868/360 - 1/6
= 868/360 - 10/60   (因为1/6 = 10/60)
= 858/360 - 10/60
= 848/360
848/360 - 5/6
= 848/360 - 50/60  (因为5/6 = 50/60)
= 798/360 
798/360 + 1/5
= 798/360 + 12/60   (因为1/5 = 12/60)
= 810/360 + 12/60
= 858/360
858/360 + 3/8 + 4/5
= 858/360 + 24/40 + 16/20    (因为3/8 = 24/40, 4/5 = 16/20)
= 882/360 + 24/40 + 16/20
= 922/360 
所以,7/9- 2/3+ 2/9 1/2+ 1/3+ 1/4 1/5+3/8+4/54/7+ 2/9-4/7 1- 1/6-5/6 1/5+ 3/8+ 4/5
= 922/360