数学题(+1/5)-(+1/4)+(-3/5)-(-6又3/4)=?

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数学题(+1/5)-(+1/4)+(-3/5)-(-6又3/4)=?
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数学题(+1/5)-(+1/4)+(-3/5)-(-6又3/4)=?
数学题(+1/5)-(+1/4)+(-3/5)-(-6又3/4)=?

数学题(+1/5)-(+1/4)+(-3/5)-(-6又3/4)=?
(+1/5)-(+1/4)+(-3/5)-(-6又3/4)
=(1/5-3/5)-(6又3/4-1/4)
=-2/5-6又1/2
=-6又9/10

(+1/5)-(+1/4)+(-3/5)-(-6又3/4)=1/5-1/4-3/5+27/4=(1/5-3/5)+(1/4-27/4)=-2/5-26/4=-2/5-13/2=-4/10-65/10=-69/10