1/21+202/2121+50505/212121+13131313/21212121=_.
问题描述:
+1 21
+202 2121
+50505 212121
=______. 13131313 21212121
答
121+2022121+50505212121+1313131321212121,=121+20221×101+5050521×10101+1313131321×1010101,=121+2×10121×101+5×1010121×10101+13×101010121×1010101,=121+221+521+1321,=2121,=1.