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当前位置:首页 >> 2015×2016+2016×2017+2015×2017 >>

2015×2016+2016×2017+2015×2017

假设x=2016,那么 原式=(x-1)x+x(x+1)+(x-1)(x+1) =3x^2-1 将x=2016代入,则 原式=3*2016^2-1=12192767 码字不易,敬请采纳。

2016×2017+2017+2015分之2016×2016 =2017x(2016+1)+2015x(2016/2015)+1x(2016/2015) =2017x2017+2016+1+1/2015 =2017x(2017+1)+1/2015 =2017x2018+1/2015 =2000x2018+10x2018+7x2018+1/2015 =4036000+20180+14126+1/2015 =4070306+1/2015 =40703...

等于1

(2014+2015+2016+2017+2018)÷2016 =(2016×5)÷2016 =(2016÷2016)×5 =1×5 =5

主要是应用平方差公式, 2016有平方,对吗? 2016^2-2015×2017 =2016^2-(2016-1)(2016+1) =2016^2-(2016^2-1) =2016^2-2016^2+1 =1。

2015×2016×2017+2五次方×3²×7=(a+b)³ 2五次方×3²×7=2016 2015×2016×2017+2016=(a+b)³ 2016×(2015×2017+1)=(a+b)³; 2016×[(2016-1)×(2016+1)+1]=(a+b)³; 2016×[(2016²-1²)+1]=(a+b)³ 2016³=...

2018+2017-2016-2015+2014+2013-2012-2011+……-4-3+2+1 =(2018+2017)-(2016-2014)-(2015-2013)-(2012-2010)-(2011-2009)-……-(4-2)-(3-1) =2018+2017-2×2016÷4×2 =2018+2017-2016 =2019

2015×2017/2016 =(2016-1)x(2016+1)/2016 =2016^2 /2016-1/2016 =2016-1/2016 =2015又2015/2016

=2014X2016+(2014-1)X2017 =2014X2016+2014X2017-2017 =2014X(2016+2017)-2017 =2014X4033-2017 =2014X4033-2014-3 =2014X4032-3

2016×2017-2015×2018 =2016×2017-2015×2017-2015 =(2016-2015)×2017-2015 =2017-2015 =2

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