2017乘以2018减1分之2017加2016乘以2018
(2017+2016×2018)/(2017×2018-1)
=[2017+(2017-1)×(2017+1)]/(2017×2018-1)
=(2017+2017²-1)/(2017×2018-1)
=[2017×(1+2017)-1]/(2017×2018-1)
=(2017×2018-1)/(2017×2018-1)
=1
2017+2016*2018/2017*2018-1
=2017+(2017-1)(2017+1)/2017*(2017+1)-1
=2017+2017^2-1/2017*(2017+1)-1
=2017(1+2017)-1/2017*(1+2017+1)-1
=1
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