( 158 x 168 - 158 x 58 ) : 11 : 10
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![](https://rs.olm.vn/images/avt/0.png?1311)
(158x168-79x58):11:10
=(26 544-4582):11:10
=21 962:11:10
=21 962/11:10
=10981/55
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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- 2009 + x = 58 - ( 158 - 9 )
- 2009 + x = 58 - 149
- 2009 + x = -91
x = -91 - (-2009)
x = 1918
vậy................
![](https://rs.olm.vn/images/avt/0.png?1311)
-37 . (-58 ) + 37 . (-158 )
= -37 . ( -58 + 158 )
= -37 . 100
= -3700
![](https://rs.olm.vn/images/avt/0.png?1311)
Đặt A = \(\dfrac{3}{6\cdot8}+\dfrac{3}{8\cdot10}+...+\dfrac{3}{158\cdot160}\)
A = \(\dfrac{3}{2}\cdot\left(\dfrac{2}{6\cdot8}+\dfrac{2}{8\cdot10}+...+\dfrac{2}{158\cdot160}\right)\)
A = \(\dfrac{3}{2}\cdot\left(\dfrac{1}{6}-\dfrac{1}{8}+\dfrac{1}{8}-\dfrac{1}{10}+...+\dfrac{1}{158}-\dfrac{1}{160}\right)\)
A = \(\dfrac{3}{2}\cdot\left(\dfrac{1}{6}-\dfrac{1}{160}\right)\)
A = \(\dfrac{3}{2}\cdot\dfrac{77}{480}\)
A = \(\dfrac{77}{320}\)
Vậy: A = \(\dfrac{77}{320}\)
(158x168-158x58):11:10=158x(168-58):(11x10)=158x110:110=158x1=158
dap so chinh xac 100%la 158