简算(5/14)*(5/6)-(7/12)*(5/ - 知识问答

简算(5/14)*(5/6)-(7/12)*(5/14)+(9/20)*(5/14)

3个回答

(5/14)*(5/6)-(7/12)*(5/14)+(9/20)*(5/14)
=(5/14)* [ (5/6)-(7/12)+(9/20) ]
=(5/14)* [ 50/60 -35/60 +27/60 ]
=(5/14)* (42/60)
=(5/14)*(7/10)
=1/4

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