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\(x:\left[\left(1800+600\right):30\right]=560:\left(315-35\right)\)
\(x:\left[2400:30\right]=560:280\)
\(x:80=2\)
\(x=2\times80\)
\(x=160\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5 x 7 x 77 -7 x 60 + 49 x25 - 15 x 42
=7x385-7x60+49x25-15x42
=7x(385-60)+49x25-15x42
=7x325+49x25-15x42
=2275+49x25-15x42
=2275+1225-630
=3500-630
=2870
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a. x : [( 1800 + 600 ) : 30] = 560 : (315 - 35)
x : [2400 : 30] = 560 : 280
x : 80 = 2
x = 2 . 80
x = 160
b. [( 250 - 25 ) : 15] : x = ( 450 - 60 ) : 130
= [ 225 : 15 ] : x = 390 : 130
= 15 : x = 3
x = 15 : 3
x = 5
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x : [ ( 1800 + 600) : 30 ] = 560 : ( 315 - 35 )
x : [ 2400 : 30 ] = 560 : 280
x : 80 = 2
x = 160
b) [ ( 250 - 25 ) : 15 ] : x = (450 - 60 ) : 130
[ 225 : 15 ] : x = 390 : 130
15 : x = 3
x = 15 : 3
x = 5
a) x : [ (1800 + 600) : 30 ] = 560 : (315 - 35)
x : 80 = 2
x = 80 : 2
x = 40
b) [ (250 - 25) : 15 ] : x = (450 - 60) : 130
15 : x = 3
x = 15 : 3
x = 5
![](https://rs.olm.vn/images/avt/0.png?1311)
Làm nốt phần còn lại nha!
b) [( 250 - 25 ) : 15 ] : X = ( 450 - 60 ) : 130
[ 225 : 15 ] : x = 390 : 130
15 : x = 3
x = 15 : 3
x = 5
Lm roy nhớ ủng hộ! :)
a)
x : [ ( 1800 + 600) : 30] = 560 : ( 315 - 35)
x : 2400 :30 =560 : 280
x : 80 = 2
x = 2 x 80
x = 160
Ủng hộ nha! :)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) X : ( 1800 + 600 ) : 30 = 560 : ( 315 - 35 )
X:2400:30=560:280
X:80=2
X=2x80
X=160
b) 134 - 2 x 156 - 6 x 54 - 2 x ( 9 + 6 )x X = 86
134-312-324-2x15xX=86
-502-30xX=86
-532xX=86
X=86:(-532)
X=-43/266
x + 30 x 5 = 600
x + 150 = 600
x = 600 - 150
x = 450
nha bn
x + 30 x 5 = 600 + 0
x + 150 = 600
x = 600 - 150
x = 450