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=(2015/ 2019 + 3/2019 + 1/2019 ) : 1/2
= 2019/2019 x 2
= 1 x2
=2
2015/2019:1/2+3/2019:1/2+1/2019:1/2
=(2015/2019+3/2019+1/2019):1/2
=1:1/2
=2
k cho mink nha
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
2019 + 2019 : 0,5 + 2019 : 0,2 + 2019 : 0,125
= 2019 x 1 + 2019 x 2 + 2019 x 5 + 2019 x 8
= 2019 x ( 1 + 2 + 5 + 8 )
= 2019 x 16
= 32304
Trl :
2019 + 2019 : 0,5 + 2019 : 0,2 + 2019 : 0,125
= 2019 x 1 + 2019 x 2 + 2019 x 5 + 2019 x 8
= 2019 x ( 1 + 2 + 5 + 8 )
= 2019 x 16
= 32304
![](https://rs.olm.vn/images/avt/0.png?1311)
89 : 0,2 + 89 + 89 : 0,25
= 89 x 5 + 89 + 89 x 4
= 89 x (5 + 1 + 4)
= 89 x 10
= 890
![](https://rs.olm.vn/images/avt/0.png?1311)
tìm x
( X x 0,25 + 2018 ) x 2019 = ( 51 + 2018 ) x 2019
( X x 0,25 + 2018 ) x 2019 = 2069 x 2019
( X x 0,25 + 2018 ) x 2019 = 4177311
X x 0,25 + 2018 = 4177311 : 2019
X x 0,25 + 2018 = 2069
X x 0,25 =2069 - 2018
X x 0,25 = 51
X = 51 : 0,25
X = 204
học tốt ^-^
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Mik làm luôn, ko vt lại đề
B = 1/1 - 1/3 + 1/3 - 1/5 +...+1/2017 - 1/2019
B = 1 - 1/2019
B = 2018/2019
TL:
\(B=1-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+...+\frac{1}{2017}-\frac{1}{2019}\)
\(B=1-\frac{1}{2019}\)
\(B=\frac{2018}{2019}\)
Vậy \(B=\frac{2018}{2019}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
#)Giải :
( 20,19 x 100 - 20,19 x 100 ) = 2019
2019 - 2019 = 2019
0 = 2019
#)P/s : Bài toán tính kiểu j vậy bạn ? sao 0 = 2019 ? lỗi đề òi :v
#~Will~be~Pens~#
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\dfrac{2019\cdot2020\left(2020\cdot10001-2019\cdot10001\right)}{2020\cdot2019\cdot2018\cdot10001}=\dfrac{10001\cdot1}{10001\cdot2018}=\dfrac{1}{2018}\)
\(2019:0,2+2019+2019:0,25\)
\(=2019:\frac{2}{10}+2019+2019:\frac{25}{100}\)
\(=2019:\frac{1}{5}+2019+2019:\frac{1}{4}\)
\(=2019\cdot5+2019+2019\cdot4\)
\(=2019\cdot(5+1+4)=2019\cdot10=20190\)
Dấu chấm là dấu nhân nhé
2019:0,2+2019+2019:0,25
=2019 x 5 +2019 +2019 x 4
=2019 x (5+1+4)
=2019 x 10
=20190