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(74,25+3/4)*x-131,5=18,5
74,25+3/4*x =18,5+131,5
74,25+3/4*x =150
3/4*x = 150-74,25
3/4*x =75,25
x = 75,25:3/4
x =
![](https://rs.olm.vn/images/avt/0.png?1311)
18 , 5 : x + 14 , 8 : x + 12 , 7 : x = 10
( 18 , 5 + 14 , 8 + 12 , 7 ) : x = 10
46 : x = 10
x = 46 : 10
x = 4 ,6
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\(x+18,9=18,5+37,5\)
\(x+18,9=56\)
\(\Rightarrow x=56-18,9\)
\(\Rightarrow x=37,1\)
x + 18,9 = 18,5 + 37,5
x + 18,9 = 56
x = 56 - 18,9
x = 37,1
![](https://rs.olm.vn/images/avt/0.png?1311)
A) x+7,8=2,04×5,1
x+7,8=10,404
x=10,404-7,8
x=2,604
B)x- 12,93=18,5-3,76
x-12,93=14,74
x=14,74+12,93
x=27,67
a/ X +7,8=2,04 x5,1
X+7,8=10,404
X=10,404-7,8
X=2,604
b/ X-12,93=18,5-3,76
X-12,93=14,74
X=14,74+12,93
X=27,67
![](https://rs.olm.vn/images/avt/0.png?1311)
(74,25 + 0,75) x a - 131,5 = 18,5
75 x a = 18,5 + 131,5
75 x a = 150
a = 2
\(\left[74,25+\frac{3}{4}\right]\times a-131,5=18,5\)
\(\Rightarrow\left[74,25+0,75\right]\times a=18,5+131,5\)
\(\Rightarrow75\times a=150\)
\(\Rightarrow a=150:75=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 4:
Trung bình mỗi ngày sửa được:
\(\dfrac{3\cdot2.05+5\cdot2.17}{8}=2.125\left(km\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(74,25+\frac{3}{4}\right)\times x-131,5=18,5\)
\(75\times x=18,5+131,5\)
\(75\times x=150\)
\(x=150:75\)
\(x=2\)
\(\frac{3}{4}=0,75\)
(74,25+0,75)x\(x\)-131,5=18,5
75 x \(x\)-131,5=18,5
75x\(x\) =18,5+131,5
75x\(x\) =150
\(x\) =150:75
\(x\) =2
![](https://rs.olm.vn/images/avt/0.png?1311)
18,5 * x + 654,5*x = 3028,5
x * ( 18,5 + 654,5) =3028,5
x * 673 =3028,5
x =3028,5 : 673
x = 4,5
18,5xX+654,5xX=3028,5
(18,5+654,5)xX= 3028,5
673 xX=3028,5
X=3028,5:673
X4,5