下面的计算错在哪里,怎么改正
(+1/4/5)-(+2/3)-(-1/5)-(+1/1/3)=1/4/5-2/3+1/5-1/1/3=(1/4/5+1/5)-(2/3-1/1/3)=2-(-2/3)=...
(+1/4/5)-(+2/3)-(-1/5)-(+1/1/3)
=1/4/5-2/3+1/5-1/1/3
=(1/4/5+1/5)-(2/3-1/1/3)
=2-(-2/3)
=2+2/3
=2/2/3 展开
=1/4/5-2/3+1/5-1/1/3
=(1/4/5+1/5)-(2/3-1/1/3)
=2-(-2/3)
=2+2/3
=2/2/3 展开
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