![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,123\times54+27\times123-12\times123+123\times31\)
\(=123\times\left(54+27-12+31\right)\)
\(=123\times100\)
\(=12300\)
\(b,\dfrac{121}{27}\times\dfrac{54}{11}< n< \dfrac{100}{21}:\dfrac{25}{126}\)
\(22< n< \dfrac{100}{21}\times\dfrac{126}{25}\)
\(22< n< 24\)
Vì \(23>22\) và \(23< 24\) nên \(n=23\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a123x54+27x123-12x123+123x31
=123:54+27:123-12:123+123:31
=6642+27:123-12:123+123:31
=6642+3321-12:123+123:31
=6642+3321-1476+123:31
=6642+3321-1476+3813
=12300
b,121/27x54/11<n>100/21:25/126
=22<n>24
n=23
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có : \(\frac{54}{11}\times\frac{121}{24}\)= 24,75
\(\frac{100}{21}:\frac{25}{126}\) = 24
Vì 24,75 > 24 nên không có trường hợp nào thỏa mãn điều kiện trên
\(\Rightarrow n\in\varnothing\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
18/27=2/3
35/25=7/5
54/72=3/4
78/66=13/11
92/100=23/25
75/125=3/5
126/165=42/55
150/300=1/2
1717/1515=17/15
![](https://rs.olm.vn/images/avt/0.png?1311)
\(25\times4\times46+25\times54\times4\)
\(\Rightarrow25\times4\times\left(46+54\right)\)
\(\Rightarrow100\times100\)
\(\Rightarrow10000\)
25 × 4 × 46 + 25 × 54 × 4
=25 × 4 × ( 46 + 54 )
=100 × 100
=10000
![](https://rs.olm.vn/images/avt/0.png?1311)
125/90=25/18
84/91=12/13
75/45=25/15=5/3
6/7=18/21=54/63=104/126
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{54}{11}\times\frac{121}{24}< n< \frac{100}{21}\div\frac{25}{126}\Leftrightarrow\frac{99}{4}< n< 24\Leftrightarrow24,75< n< 24\)\(24\)
Vậy không có giá tri của n
![](https://rs.olm.vn/images/avt/0.png?1311)
3, 54 x 73 + 0,23 x 25 + 3,54 x 27 + 0,17 x 25
= 3,54 x 73 + 3,54 x 27 + 0,23 x 25 + 0,17 x 25
= 3,54 x(73+27) + 25 x (0,23+0,17)
= 3,54 x 100 + 25 x 0,4
= 3,54 x 100 + 10
= 35,4 x 10 + 10
= 10 x (35,4+1)
= 10 x 36,4
= 364