6分之5减12分之1减20分之9加30分之11减4 - 知识问答

6分之5减12分之1减20分之9加30分之11减42分之1简便运算

2个回答

5/6 -1/12 -9/20 +11/30 -1/42
=5/6 -1/42 -1/12 -9/20 +11/30
=35/42 -1/42 - 5/60 -27/60 + 22/60
=34/42 -10/60
=34/42 -1/6
=34/42 -7/42
=27/42
=9/14

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