2\3-6\2+12\7-20\9+30\11-42\13+56\15 （简算）第二个是2\6

2\3-6\2+12\7-20\9+30\11-42\13+56\15 （简算）第二个是2\6
2\3-6\2+12\7-20\9+30\11-42\13+56\15 （简算）
第二个是2\6

2\3-6\2+12\7-20\9+30\11-42\13+56\15 （简算）第二个是2\6
分子在上,分母在下 应该是六分之五吧
3/2-5/6+7/12-9/20+11/30-13/42+15/56
=1+1/2-(1/2+1/3)+1/3+1/4-(1/4+1/5)+1/5+1/6-(1/6+1/7)+1/7+1/8
=1+1/2-1/2-1/3+1/3+1/4+.+1/7+1/8
=1+1/8
=9/8

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2\3-6\2+12\7-20\9+30\11-42\13+56\15