120:{54-[50:2(9-2.40}]
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(120:\left\{54-\left[50:2-\left(32-2,4\right)\right]\right\}\)
\(=120:\left[54-\left(25-29,6\right)\right]\)
\(=120:\left[54-\left(-4,6\right)\right]\)
\(=120:58,6\)
\(=\dfrac{600}{293}\)
đề lỗi hay bạn lỗi hả chứ kết quả cũng ra đc nhưng mà nó lạ lắm bạn kiểm tra lại câu hỏi chưa vậy
![](https://rs.olm.vn/images/avt/0.png?1311)
TL :
120 : 54 - [ 50 : 2 - 32 - 2 x 4 ]
120 : 54 - [ 50 : 2 - 9 - 8 ]
120 : 54 - [ 25 - 1 ]
120 : 54 - 24
120 : 30
4
![](https://rs.olm.vn/images/avt/0.png?1311)
\(B=-11,2+1,456.\frac{25}{7}-\frac{9}{2}.40\%=-7,8\)
Tích cho mk nha!
-11,2 + 1,456 . 25/7 - 9/2 . 40%
= -11,2 + 26/5 - 9/2 . 4/10
= -11,2 + 26/5 - 9/5
= -6 - 9/5
= 39/5 = 7,8
![](https://rs.olm.vn/images/avt/0.png?1311)
c) 3⁴ - 5.42
= 81 - 210
= -129
d) 120 : {54 - [50 : 2 - (3² - 2.4)]}
= 120 : {54 - [25 - (9 - 8)]}
= 120 : [54 - (25 - 1)]
= 120 : (54 - 24)
= 120 : 30
= 4
![](https://rs.olm.vn/images/avt/0.png?1311)
f, \(\dfrac{165}{270}\) = \(\dfrac{165:15}{270:15}\) = \(\dfrac{11}{18}\) = \(\dfrac{11\times6}{18\times6}\) = \(\dfrac{66}{108}\)
\(\dfrac{91}{156}\) = \(\dfrac{91:13}{156:13}\) = \(\dfrac{7}{12}\) = \(\dfrac{7\times9}{12\times9}\) = \(\dfrac{63}{108}\)
\(\dfrac{210}{1134}\) = \(\dfrac{210:42}{1134:42}\) = \(\dfrac{5}{27}\) = \(\dfrac{5\times4}{27\times4}\) = \(\dfrac{20}{108}\)
g, \(\dfrac{21}{9}\) = \(\dfrac{21:3}{9:3}\) = \(\dfrac{7}{3}\) = \(\dfrac{7\times10}{3\times10}\) = \(\dfrac{70}{30}\)
\(\dfrac{120}{50}\) = \(\dfrac{120:10}{50:10}\) = \(\dfrac{12}{5}\) = \(\dfrac{12\times6}{5\times6}\) = \(\dfrac{72}{30}\)
\(\dfrac{63}{54}\) = \(\dfrac{63:9}{54:9}\) = \(\dfrac{7}{6}\) = \(\dfrac{7\times5}{6\times5}\) = \(\dfrac{35}{30}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
120/{54-[50/2-(3^2-2*4)]}
120/{54-[50/2-(9-8)]}
120/{54-[25-1]}
120/{54-24}
120/30
4
![](https://rs.olm.vn/images/avt/0.png?1311)
c: \(=160:\left\{120-\left[24+4^2\right]\right\}\)
\(=160:80\)
=2
=120:{54-25(9-80)}
=120:{54-25*(-71)}
=120/1829
\(120:\left\{54-\left[50:2\left(9-2.40\right)\right]\right\}\)
\(=120:\left\{54-\left[50:2\times-71\right]\right\}\)
\(=120:\left\{54--1775\right\}\)
\(=120:1829\)
\(=\dfrac{120}{1829}\)