570,4 x 20,307 46
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a, 49 x 385 - 39 x 385
= 385 x ( 49 - 39)
= 385 x 10
= 3850
b, 46 x 17 + 38 x 46 + 46 x 44 + 46
= 46 x 17 + 38 x 46 + 46 x 44 + 46 x 1
= 46 x (17 + 38 + 44 + 1)
= 46 x 100
= 4600
![](https://rs.olm.vn/images/avt/0.png?1311)
46 x 17 - 38 x 46 - 26 x 44 - 46
= 782 - 1748 - 1144 - 46
= -966 - 1098
= -2064 nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
-43 . 92 - 46 . 27 + 46 . 41
= -3956 - 1242 + 1886
= -5198 + 1886
= -3312
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Sửa đề: \(\left(46\times369+46\right)-\left(268\times45+268\right)\)
\(=46\times\left(369+1\right)-268\times\left(45+1\right)\)
\(=46\times\left(370-268\right)\)
\(=46\times102\)
\(=4692\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{12.23+23.88}{46.3+46.14}\)
\(=\frac{23.\left(12+88\right)}{46.\left(3+14\right)}\)
\(=\frac{23.100}{46.17}\)
\(=\frac{23.2.50}{23.2.17}\)
\(=\frac{50}{17}\)
\(\frac{12x23+23x88}{46x3+46x14}\)
=\(\frac{23x\left(12+88\right)}{46x\left(14+3\right)}\)
=\(\frac{23x100}{46x17}\)
= \(\frac{50}{17}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3,54\times73+0,46\times25+3,54\times26+0,46\times75+3,54\)
\(=3,54\times\left(73+26+1\right)+0,46\times\left(25+75\right)\)
\(=3,54\times100+0,46\times100\)
\(=354+46=400\)
nè = 11583.375184