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x + 3,7.x + x.5,3 = 2018
x.( 1 + 3,7 + 5,3 ) = 2018
x . 10 = 2018
x = 201,8
x+3,7.x+x.5,3=2018
x( 1+3,7+5,3) =2018
x. 10 =2018
x =2018:10
x =201,8
Vậy x = 201,8
Hok tốt nha bn
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8,4 x 3,7 + 8,4 x 5,3 + 8,4
= 8,4 x (3,7 + 5,3 + 1)
= 8,4 x 10
= 84
\(8,4\) x \(3,7+8,4\) x \(5,3+8,4\)
\(=8,4\) x \(\left(3,7+5,3\right)+8,4\)
\(=8,4\) x \(9+8,4\)
\(=75,6+8,4\)
\(=8,4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
TL:
54,7 x 3,7 + 54,7 x 5,3 + 54,7
= 54,7 x 3,7 + 54,7 x 5,3 + 54,7 x 1
= 54,7 x (3,7 + 5,3 + 1)
= 54,7 x 10
= 547
HT
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a) (138,4 - 83,2) : 24 + 19,22
= 55,2 : 24 + 19,22
= 2,3 + 19,22
= 21,52
b) [6,54 + (75,4 - 29,48)] :4
= (6,54 + 45,92) :4
= 52,46 : 4
= 13,115
2..................................
a) 8,7 - x = 5,3 + 2
8,7 - x = 7,3
x = 8,7 - 7,3
x = 1,4
b) x * 5,3 = 9,01 * 4
x * 5,3 = 36,04
x = 36,04 : 5,3
x = 6,8
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3,7\times3,8+6,2\times3,7\\ =3,7\times\left(3,8+6,2\right)\\ =3,7\times10\\ =37\\ 56,8\times76,9-56,8\times76,8\\ =56,8\times\left(76,9-76,8\right)\\ =56,8\times0,1\\ =5,68\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 8,7- X = 5,3 + 2
8,7 - X = 7,3
X = 8,7 - 7,3
X = 1,4
b, X x 5,3 = 9,01 x 4
X x 5,3 = 36,04
X = 36,04 : 5,3
X = 6,8
![](https://rs.olm.vn/images/avt/0.png?1311)
\(4,7\div0,25+5,3\times4\)
\(=18,8+21,2\)
\(=40\)
\(3\times\left(a-2\right)+150=240\)
\(3\times\left(a-2\right)=90\)
\(a-2=30\)
\(a=32\)
\(\dfrac{1}{9}+a+\dfrac{7}{12}=\dfrac{17}{18}\)
\(\dfrac{1}{9}+a=\dfrac{13}{36}\)
\(a=\dfrac{1}{4}\)
\(\left(\dfrac{1}{2}\times\dfrac{1}{3}+\dfrac{1}{3}\times\dfrac{1}{4}+\dfrac{1}{4}\times\dfrac{1}{5}+\dfrac{1}{5}\times\dfrac{1}{6}+\dfrac{1}{6}\times\dfrac{1}{7}+\dfrac{1}{7}\times\dfrac{1}{8}\right)\times a=\dfrac{9}{16}\)
\(\left(\dfrac{1}{2\times3}+\dfrac{1}{3\times4}+\dfrac{1}{4\times5}+\dfrac{1}{5\times6}+\dfrac{1}{6\times7}+\dfrac{1}{7\times8}\right)\times a=\dfrac{9}{16}\)
\(\left(\dfrac{1}{2}-\dfrac{1}{8}\right)\times a=\dfrac{9}{16}\)
\(\dfrac{3}{8}\times a=\dfrac{9}{16}\)
\(a=\dfrac{3}{2}\)
A x 5,3 + A x 3,7 + A = 320
A x ( 5,3 + 3,7 + 1 ) = 320
A x 10 = 320
A = 320 : 10
A = 32
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