原式=4720 :[194 - 92X815]
47 19 9 8
= ---------- :[-------- - -------- X ------------]
20 4 2 15
47 19 1 2
= -------- :【 --------- - ------------】
20 4 5
47 95 - 48
= --------- :--------------
2 0 20
47 20
= ---------- X ------------
2 0 47
= 1
原式=4720 :[194 - 92X815]
47 19 9 8
= ---------- :[-------- - -------- X ------------]
20 4 2 15
47 19 1 2
= -------- :【 --------- - ------------】
20 4 5
47 95 - 48
= --------- :--------------
2 0 20
47 20
= ---------- X ------------
2 0 47
= 1