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23.17+47.71+83.23+47.92
=23.(17+83)+47.(29+71)
=23.100+47.100
=2300+4700
=7000
![](https://rs.olm.vn/images/avt/0.png?1311)
53 x 29 + 47 x 29 - 53 x 21 - 47 x 21
= 29 x ( 53 + 47 ) - 21 x ( 53 + 47 )
= 29 x 100 - 21 x 100
= 100 x ( 29 - 21 )
= 100 x 8
= 800
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17.54+13.71+17.46+13.29
= 17.(54+46)+13.(71+29)
=17.100+13.100
=100.(17+13)
=100.30
=3000
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =(-20/23-3/23)+(2/3+2/5+7/15)
=-1+10/15+6/15+7/15
=23/15-1=8/15
b: \(=\dfrac{7}{5}\cdot\dfrac{29}{4}-\dfrac{7}{5}\cdot\dfrac{9}{4}+\dfrac{41}{13}=\dfrac{7}{5}\cdot5+\dfrac{41}{13}=7+\dfrac{41}{13}=\dfrac{132}{13}\)
c: =3,07+7,005-23,005+5,23
=8,3-16
=-7,7
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Sửa đề: 8666
8666*15+170*4333
=4333*(2*15+170)
=200*4333
=866600
![](https://rs.olm.vn/images/avt/0.png?1311)
A = 44 . 82 -22 + 18 . 44
= 44 . 82 - 4 + 18 . 44
= 44. ( 82 + 18 ) - 4
= 44 . 100 - 4
= 4400 - 4
= 4396
Ta có: \(A=44\cdot82-2^2+18\cdot44\)
\(=44\cdot\left(82+18\right)-4\)
\(=44\cdot100-4\)
\(=4400-4=4396\)
47.29-13.29-4.29
=(47-13-4).29
=30.29
=870
-Học tốt-