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![](https://rs.olm.vn/images/avt/0.png?1311)
X x 4 + X x 7 + X x 9 = 40300
X x ( 4 + 9 + 7 ) = 40300
X x 20 = 40300
X = 40300 : 20
X = 2015
Mọi người li-ke mik nhé !!!
![](https://rs.olm.vn/images/avt/0.png?1311)
x * 4 + x * 7 + x * 9 = 40300
x * ( 4 + 7 + 9 ) = 40300
x * 20 = 40300
x = 40300 : 20
x = 2015
x*4+x*7+x*9=40300
suy ra x*(4+7+9)=40300
suy ra x*20=40300
suy ra x=40300:20
suy ra x=2015
vậy x=2015
![](https://rs.olm.vn/images/avt/0.png?1311)
X x 4 + X x 7 + X x 9 = 40300
=> X x ( 4 + 7 + 9 ) = 40300
=> X x 20 = 40300
=> X = 40300 : 20
=> X = 2015
Nhớ tick mik nha !!!
![](https://rs.olm.vn/images/avt/0.png?1311)
X x 4 + X x 7 + X x 9 = 40300
X x (4 + 7 + 9) = 40300
X x 20 = 40300
X = 40300 : 20 = 2015
![](https://rs.olm.vn/images/avt/0.png?1311)
X x 4 + X x 7 + X x 9 = 40300
X x ( 4 + 7 + 9) = 40300
X x 20 = 40300
X = 40300 : 20
X = 2015
Vậy X = 2015
\(x\cdot4+x\cdot7+x\cdot9=40300\)
\(x\cdot\left(4+7+9\right)=403000\)
\(x\cdot20=40300\)
\(x=40300:20\)
\(x=2015\)
![](https://rs.olm.vn/images/avt/0.png?1311)
X x 4 + X x 7 + X x 9 = 40300
X x (4 + 7 + 9) = 40300
X x 20 = 40300
X = 40300 : 20
X = 2015
![](https://rs.olm.vn/images/avt/0.png?1311)
=> x *(7+9-1-5)=790
x* 10 =790
x =790:10
=> x =79
k mik nha bạn
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
$\frac{x+7}{x}=9$
$x+7=9\times x$
$7=9\times x-x$
$7=8\times x$
$x=7:8=\frac{7}{8}$
![](https://rs.olm.vn/images/avt/0.png?1311)
x.7+x.9-x-x.5=290
x(7+9-1-5)=290
x . 10 = 290
x =290:10
x=29
Vậy x =29
Ta có : x . 4 + x . 7 + x . 9 = 40300
=> 20 . x = 40300
=> x = 40300 : 20
=> x = 2015