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![](https://rs.olm.vn/images/avt/0.png?1311)
2.17.12+4.6.21.8.3.62
= 24.17 + 24.21.24.62
= 408 + 749952
= 750360
Hình như bạn cho lộn đề
2.17.12+4.6.21+8.3.62=2.12.17+4.6.21+8.3.62
=2.3.4.17+4.2.3.21+4.2.3.62
=(2.3.4).(17+21+62)
=24.100
=2400
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
3 + ( - 12 ) + 13 + ( -22 ) + ..........+ 93 + ( - 102 )
= [ 3 + ( -12 ) ] + [ 13 + ( -22 ) ] + ... + [ 93 + ( -102 ) ]
= -9 + ( -9 ) + .... + ( -9 )
= ( -9 ) . 10
= -90
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=1-\dfrac{17^{12}\cdot2^6\cdot3^2\cdot7}{17^6\cdot\left(3^4\cdot5^2-2^2\cdot1\right)}\)
\(=1-\dfrac{2^6\cdot3^2\cdot7}{81\cdot25-4\cdot1}\)
\(=1-\dfrac{4032}{2021}=-\dfrac{2011}{2021}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, Ư(93) = {31;93}
b, Ư(102) = {17;34;51}
c, Ư(120) = {10;12;15;20;24;30;40;60}
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1: Rút gọn
\(A=\dfrac{-56\cdot49+\left(-49\right)\cdot44}{73\cdot14+\left(-14\right)\cdot\left(-27\right)}\)
\(=\dfrac{49\cdot\left(-56-44\right)}{14\cdot\left(73+27\right)}\)
\(=\dfrac{-49\cdot100}{14\cdot100}=\dfrac{-7}{2}\)
\(4^2.17-16.11+102-93\)
\(=16.17-16.11+102-93\)
\(=16.\left(17-11\right)+9\)
\(=16.\left(6+9\right)\)
\(=16.15\)
\(=240\)