55 - [ 48 - ( 23.18 - 23.15) ]
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\(\dfrac{23\cdot18}{23\cdot2}=\dfrac{23\cdot2\cdot9}{23\cdot2}=9\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(23.18+18.\left(-23\right)\)
\(=23.18+\left(-18\right).23\)
\(=23.\left(-18+18\right)\)
\(=23.0=0\)
![](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)
\(\left(23.18\right):\left(23.2\right)=\dfrac{23.18}{23.2}=\dfrac{18}{2}=9\)
(23.18) : (23.2)= (23:23) . (18:2)= 1.9=9
![](https://rs.olm.vn/images/avt/0.png?1311)
a) = 8 . 15 - [115- 72 ]
= 8 . 15 - [115- 49 ]
= 120 - 56
= 64
b) = 100 : {250 : [450 - (2.125 - 8.25)]}
= 100 : {250 : [450 - (250 - 200 )]}
= 100 : {250 : [450 - 50]}
= 100 : {250 :400}
= 100 : 0,265
= 0,00265
=
\(a,2^3.15-\left[115-\left(12-5\right)^2\right]\)
\(=8.15-\left[115-\left(12-5\right)^2\right]\)
\(=120-\left[115-7^2\right]\)
\(=120-\left[115-49\right]\)
\(=120-66\)
\(=54\)
\(b,100:\left\{250:\left[450-\left(2.5^3-2^3.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(2.125-8.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(250-200\right)\right]\right\}\)
\(=100:\left\{250:\left[450-50\right]\right\}\)
\(=100:\left\{250:400\right\}\)
\(=100:0,625\)
\(=160\)
\(55-\left[48-\left(23.18-23.15\right)\right]\)
\(55-\left\{48-\left[23.\left(18-15\right)\right]\right\}\)
\(55-\left\{48-69\right\}\)
\(55+21\)
\(76\)
nhóm 23 vào với nhau ta
55-{48-(23(18-15)}
55-(-21)
76
vậy biểu thức trên ra 76