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当前位置:首页 >> 2018×2016/2017= >>

2018×2016/2017=

2018×2016/2017 =(2017+1)X2016/2017 =2017X2016/2017+2016/2017 =2016+2016/2017 =2016又2016/2017

=2016x2+1-1/2017+1/2018 =2033-2018/4070306+2017/4070306 =2033-1/4070306 =2032又4070305/4070306

解: a=(2018×2017-2018)/(2017×2017+2017) =2018×(2017-1)/[2017×(2017+1)] =2018×2016/(2017×2018) =2016/2017 b=(2017×2016-2017)/(2016×2016+2016) =2017×(2016-1)/[2016×(2016+1)] =2017×2015/(2016×2017) =2015/2016 a/b=(2016/2017)/(201...

计算: 2018x 2016/2017 =(2017+1)x2016/2017 =2016+2016/2017 =2016又2017分之2016

2016/2017×2018 =2016/2017×(2017+1) =2016/2017×2017+2016/2017×1 =2016+2016/2017 =2016又2016/2017

1/a = √2016+√2015 1/b = √2017+√2016 1/c = √2018+√2017 0<1/a<1/b<1/c a>b>c

期望(平均值)=(2016+2017+2018+2019+2020)÷5=2018, 方差=[(2016-2018)²+(2017-2018)²+(2018-2018)²+(2019-2018)²+(2020-2018)²]÷5 =(2²+1²+0²+1²+2²)÷5 =2

如图

2O18╳2017一2017╳2016一2016╳2015+2015╳2014简便计算 解: 2O18×2017-2017×2016-2016×2015+2015×2014 =(2018-2016)×2017-(2016-2014)×2015 =2×2017-2×2015 =2×(2017-2015) =2×2 =4

肯定后者大,你把式子写出来,两边都叫去2,剩下的通分

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