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2.52.32+{[2.53-(5x+4).5]:(22.3.5)}=453
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2.25.9+{[2.125-25.x-20]:(4.3.5)}=453
450 +{[250-25.x -20]:60 }=453
450 +{[230-25.x] :60 }=453
450 +{23/6-13/30x }=453
23/6-5/12x =453-450
46/12-5/12x =3
(46-5x)/12 =3
46-5x =3.12=36
5x =46-36=10
x=2
Mình viết cách ra cho dễ hiểu đó
2.25.9 + {[ 2.125 - ( 5x + 4 ).5 ] : ( 4.3.5 )]} = 453
= 2.25.9 + 250 - ( 5x + 4 ).5 ] : 12.5 = 453
= 50.9 + [ 250 - ( 5x + 4 ).5 ] : 60 = 453
= 450 + 250 - ( 5x + 4 ).5 = 453.60
= 450 + 250 - ( 5x + 4 ) = 453 : 5
= 450 + 250 - ( 5x + 4 ) = 90,6
= 450 + 250 - 5x = 90,6 - 4
= 450 + 250 - 5x = 86,6
= 700 - 5x = 86,6
= 86,6 + 700
= 5x = 786,6
= 786,6 : 5
= 157,32
2.25.9 + {[ 2.125 - ( 5x + 4 ).5 ] : ( 4.3.5 )]} = 453
= 2.25.9 + 250 - ( 5x + 4 ).5 ] : 12.5 = 453
= 50.9 + [ 250 - ( 5x + 4 ).5 ] : 60 = 453
= 450 + 250 - ( 5x + 4 ).5 = 453.60
= 450 + 250 - ( 5x + 4 ) = 453 : 5
= 450 + 250 - ( 5x + 4 ) = 90,6
= 450 + 250 - 5x = 90,6 - 4
= 450 + 250 - 5x = 86,6
= 700 - 5x = 86,6
= 86,6 + 700
= 5x = 786,6
= 786,6 : 5
= 157,32
Answer : 157,32
\(24\cdot55+5^2\cdot53\)
\(=24\cdot55+25\cdot53\)
\(=1320+1325\)
\(=2645\)
24 x 55 + \(5^2\)x 53
= 1320 + 25 x 53
= 1320 + 1325
= 2645
\(a,\left\{\left[\left(37+13\right):5\right]-45:5\right\}.7\)
\(=\left\{\left[50:5\right]-45:5\right\}.7\)
\(=\left\{10-45:5\right\}.7\)
\(=\left\{10-9\right\}.7\)
\(=1.7=7\)
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
=
\(a,2^3.15-\left[115-\left(12-5\right)^2\right]\)
\(=8.15-\left[115-\left(12-5\right)^2\right]\)
\(=120-\left[115-7^2\right]\)
\(=120-\left[115-49\right]\)
\(=120-66\)
\(=54\)
\(b,100:\left\{250:\left[450-\left(2.5^3-2^3.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(2.125-8.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(250-200\right)\right]\right\}\)
\(=100:\left\{250:\left[450-50\right]\right\}\)
\(=100:\left\{250:400\right\}\)
\(=100:0,625\)
\(=160\)
2.25.9+{[2.125-(5x+4).5]:(4.3.5)}=453
50.9+{[350-(5x+4).5]:60}=453
450+{[350-(5x+4).5]:60}=453
[350-(5x+4).5]:60=453-450
[350-(5x+4).5]:60=3
350-(5x+4).5=3.60
350-(5x+4).5=180
350-(5x+4)=180:5
350-(5x+4)=36
5x+4=350-36
5x+4=314
5x=314-4
5x=310
x=310:5
x=62
thanks you