计算: 1.(3/14)+(1/14)+(3/14) 2.(13/15)+(7/15)+(1/15) 3.(37/40)-(7/40)-(5/40) 4.1-(7/30)-(11/30)

问题描述:

计算: 1.(3/14)+(1/14)+(3/14) 2.(13/15)+(7/15)+(1/15) 3.(37/40)-(7/40)-(5/40) 4.1-(7/30)-(11/30)
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1.(3/14)+(1/14)+(3/14)=(3+1+3)/14=7/14=1/2
2.(13/15)+(7/15)+(1/15)=(13+7+1)/15=21/15=7/5
3.(37/40)-(7/40)-(5/40) =(37-7-5)/40=35/40=7/8
4.1-(7/30)-(11/30)=30/30-7/30)-(11/30)=(30-7-11)/30=12/30=2/5