1.原式=[362+(186+362)*(362-1)]/[362*(186+362)-186]=[362+186*362+362*362-186-362]/[362*186+362*362-186]=[186*(362-1)+362*362]/[186*(362-1)+362*362]=1
2.原式=[1988+(1988+1)*(1988-1)]/[1988*(1988+1)-1]=[1988+1988*1988+1988-1988-1]/[1988*1988+1988-1]=[1988*1988+1988-1]/[1988*1988+1988-1]=1
3.同理计算减号前面的分式等于1,然后1-1/143=142/143
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