1）1／2-[3／4-（1／4-5-1／2）]求题 - 知识问答

1）1／2-[3／4-（1／4-5-1／2）]求题解

2个回答

1/2-(3/4+21/4)
=1/2-6
=-11/2
(-1/6-1/16+3/4-1/12)
=[(3/4-1/16)-(1/6+1/12)]
=[(12/16-1/16)-(2/12+1/12)]
=(11/16-3/12)
=(11/16-1/4)
=(11/16-4/16)
=7/16

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