1/21+202/2121+50505/212121+13131313/21212121=_.
问题描述:
+1 21
+202 2121
+50505 212121
=______. 13131313 21212121
答
+1 21
+202 2121
+50505 212121
,13131313 21212121
=
+1 21
+202 21×101
+50505 21×10101
,13131313 21×1010101
=
+1 21
+2×101 21×101
+5×10101 21×10101
,13×1010101 21×1010101
=
+1 21
+2 21
+5 21
,13 21
=
,21 21
=1.