0-(+1/2)-(+2/5)-(-3/4)-(+1/4)-(-3/5)等于几过程清晰

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0-(+1/2)-(+2/5)-(-3/4)-(+1/4)-(-3/5)等于几过程清晰0-(+1/2)-(+2/5)-(-3/4)-(+1/4)-(-3/5)等于几过程清晰0-(+1/2)-(+2/5

0-(+1/2)-(+2/5)-(-3/4)-(+1/4)-(-3/5)等于几过程清晰
0-(+1/2)-(+2/5)-(-3/4)-(+1/4)-(-3/5)等于几过程清晰

0-(+1/2)-(+2/5)-(-3/4)-(+1/4)-(-3/5)等于几过程清晰
0-(+1/2)-(+2/5)-(-3/4)-(+1/4)-(-3/5)
=-1/2 +(3/5-2/5)+(3/4-1/4)
=-1/2+1/5+1/2
=(-1/2+1/2)+1/5
=0+1/5
=1/5

等于五分之一也就是0.2!过程如下!