2+3+5+13+2/99+11/63+25/35+5/15=_.
问题描述:
2+3+5+13+
+2 99
+11 63
+25 35
=______. 5 15
答
2+3+5+13+
+2 99
+11 63
+25 35
,5 15
=2+3+5+13+
+2 99
+2 63
+9 63
+5 7
,1 3
=23+
-1 9
+1 11
-1 7
+1 9
+1 7
+5 7
,1 3
=23-
+1+1 11
,1 3
=24-
+3 33
,11 33
=24+
,8 33
=24
.8 33