\(\frac{2015+2016.2017}{2017.2018-2019}\)
\(=\frac{2015+2016.2017}{2017.\left(2016+2\right)-2019}\)
\(=\frac{2015+2016.2017}{2017.2016+4034-2019}\)
\(=\frac{2015+2016.2017}{2017.2016+2015}\)
\(=1\)
Tính:
\(A=\frac{1x2+2x3+3x4+...+2016x2017}{2017x2018}\)
\(\frac{2017x2018+1}{2019+2016x2018}\)Tính nhanh
Tính hợp lý:
a,21,18x2117-2017x2018
b,(1+3+5+ .......+2019)x(432432x468-234234x864)
Giúp mình nha
Tính nhanh
2016 x 2018 -1
_____________
2015+2016x2017
Tính nhanh:
a)\(\frac{2018x2019-2017}{2017x2018+2019}\) b)\(\frac{2018x2018}{2017x2019+1}\)
so sánh 2 phân số
A = \(\frac{2017x2018-1}{2017x2018-2}\)và B = \(\frac{2017}{2018}\)
1x2+2x3+3x4+4x5+...2016x2017
Tính bằng cách thuận tiện nhất:
2015/2019 : 1/2 + 3/2019 :1/2 + 1/2019 : 1/2
\(B=\dfrac{2017x2018+1000}{2018x2018-1018}\) help meeeeeeeeeeeeeeeeeeeeeee
