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Ta có: A = 98 x a + 2 x a + 118 x b - 18 x b
= (98+2) x a + (118-18) x b
= 100 x a + 100 x b
= 100 x (a+b)
= 100 x 240
= 24000
![](https://rs.olm.vn/images/avt/0.png?1311)
A=98 x a+118 x b+2 x a-18 x b
=(98+2) x a+(118-18) x b
=100 x a+100 x b
=100 x (a+b)
=100 x 20 x 12
=2000 x 12
=24000
![](https://rs.olm.vn/images/avt/0.png?1311)
10.6 : x + 7.19 : x = 3
(10,6+7,19):x=3
17,79:x=3
x=17,79:3
x=5,93
7 : x - 3.9 : x = 5
(7-3,9):x=5
3,1:x=5
x=3,1:5
x=0,62
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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
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![](https://rs.olm.vn/images/avt/0.png?1311)
a ) \(x\times3,9+x\times0,1=2,7\)
\(x\times\left(3,9+0,1\right)=x\times4=2,7\)
x = 2,7 : 4 = 0,675
b ) \(\frac{12,3}{x}-\frac{4,5}{x}=15=\frac{7,8}{x}\)
\(=7,8\div x=15\)
\(x=15\div7,8=\frac{15}{7,8}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
X:10+Xx3,9=4,8
Xx0,1+Xx3,9=4,8
Xx(0,1+3,9)=4,8
Xx4=4,8
X=4,8:4
X=1,2
X : 10 + X x 3,9 = 4,8
X x 0,1 + X x 3,9 = 4,8
X x (0,1 + 3,9) = 4,8
X x 5 = 4,8
X = 4,8 : 5
X = 0,96
![](https://rs.olm.vn/images/avt/0.png?1311)
12.4-x:34.2=3.9
x:34.2=12.4-3.9
x:34.2=8.5
x =8.5x34.2
x =290.7
\(12.4-x:34.2=3.9\)
\(x:34.2=12.4-3.9\)
\(x:34.2=8.5\)
\(x=8.5\cdot34.2\)
\(x=290.7\)
![](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
\(20,21\times35+2,012\times250+201,2\times3,9+20,12\)
Sửa đề : \(20,12\times35+2,012\times250+201,2\times3,9+20,12\)
\(=20,12\times35+2,012\times25\times10+201,2\times3,9+20,12\times1\)
\(=20,12\times35+20,12\times25+20,12\times39+20,12\times1\)
\(=20,12\times\left(35+25+39+1\right)\)
\(=20,12\times\left(60+39+1\right)\)
\(=20,12\times\left(99+1\right)\)
\(=20,12\times100\)
\(=2012\)
Sửa đề: 20,12x35+2,012x250+201,2x3,9+20,12
=20,12x35+20,12x25+20,12x39+20,12
=20,12x(35+25+39+1)
=20,12x100=2012