(+4/5)-(+2/3)-(-1/5)-(+1/3)=4/5-2/3+1/5-1/3=(4/5+1/5)-(2/3-1/3)=1-(1/3)=1/3 这题错在那里是有理数的减法

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(+4/5)-(+2/3)-(-1/5)-(+1/3)=4/5-2/3+1/5-1/3=(4/5+1/5)-(2/3-1/3)=1-(1/3)=1/3 这题错在那里是有理数的减法
(+4/5)-(+2/3)-(-1/5)-(+1/3)=4/5-2/3+1/5-1/3=(4/5+1/5)-(2/3-1/3)=1-(1/3)=1/3 这题错在那里
是有理数的减法

(+4/5)-(+2/3)-(-1/5)-(+1/3)=4/5-2/3+1/5-1/3=(4/5+1/5)-(2/3-1/3)=1-(1/3)=1/3 这题错在那里是有理数的减法
(+4/5)-(+2/3)-(-1/5)-(+1/3)=4/5-2/3+1/5-1/3)=1-(1/3)=1/3
=(4/5+1/5)-(2/3-1/3) 这儿错了,应该是=(4/5+1/5)-(2/3+1/3)

=(4/5+1/5)-(2/3-1/3)错在这里 应该是(4/5+1/5)-(2/3+1/3) =0

错在最后那了=(4/5+1/5)-(2/3-1/3)=1-(1/3)=1/3,
应该是=(4/5+1/5)-(2/3+1/3)=1-1=0