84又1/2÷14+16又1/2×1/14-(1-13/14)
=84又1/2×1/14+16又1/2×1/14-1/14
=1/4×(84又1/2+16又1/2-1)
=1/4×100
=25=1/4×(84又1/2+16又1/2-1)这一步错了 是1/14×（84又1/2+16又1/2-1）84又1/2÷14+16又1/2×1/14-(1-13/14)=84又1/2×1/14+16又1/2×1/14-1/14=1/14×(84又1/2+16又1/2-1)=1/14×100=50/7真是不好意思(84又1/2+16又1/2-1)这一步你确定对吗对的