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2017X2017һ2019X2019

2017X2017һ2019X2019=2017-2019=(2017+2019)(2017-2019)=4036*(-2)=-8072

2017*2017-2019*2019=(2017+2019)*(2017-2019)=4036*(-2)=-8072

2019X2018һ2017X2020=2019X2018һ2017X(2019+1)=2019X2018һ2017X2019-2017=2019X(2018һ2017)-2017=2019-2017=2

Ϊ:4 :2019*2018-2018*2017-2017*2016+2016*2015=2018*(2019-2017)-2016*(2017-2015) (ó˷,ȡʽ)=2018*2-2016*2=2*(2018-2016) (˷ɵ)=2*2=4 չ ķ:

2017x2018+2019x2020-2x2018x2019=2019x(2020-2018)+2018x(2017-2019)=2019x2+2018x(-2)=4038-4036=2

ƽ,x-20170 x2017 |2015-x|+(x-2017)=x x-2015+(x-2017)=x (x-2017)=2015 x-2017=2015 x-2015=2017 x-2015ֵΪ2017 ĹؼжxȡֵΧ.

2017x-2018y=20192016x-2017y=2018 ʽ2016-ʽ2017,2017*2016x-2018*2016y-2016*2017x+2017*2017y=2019*2016-2018*2017 :2017*2017y-2018*2016y=2019*2016-2018*20172017*2017y-(2017+1)*(2017-1)y=2019*

2018*2018-2017*2019-999*999=2018-(2018-1)*(2018+1)-999=2018-(2018-1)-999=2018-2018+1-999=1-999=(1+999)*(1-999)=1000*(-998)=-998000

2018x2017-2017=2017x2018-2017*1=2017*(2018-1)=2017*2017=2017=4068289

2017*2019-20182017*2019-2018=2016*2019+1(2017*2018-1)=4070304+1(4070306-1)=4070305

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