Tìm x a x * 5,2 : 4,5 = 10,4 b 5/7 * x + 2/7 * x = 2/3 giúp mình nha
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a)x*5,2:4,5=10,4
x*5,2=10,4*4,5
x*5,2=46,8
x =46,8:5,2
x =9
b)5/7*x+2/7*x=2/3
x*(5/7+2/7)=2/3
x*1 =2/3
x =2/3:1
x =2/3
a.
\(x\times5,2\div4,5=10,4\)
\(x\times5,2=10,4\times4,5\)
\(x\times5,2=46,8\)
\(x=46,8\div5,2\)
\(x=9\)
b.
\(\dfrac{5}{7}\times x+\dfrac{2}{7}\times x=\dfrac{2}{3}\)
\(x\times\left(\dfrac{5}{7}+\dfrac{2}{7}\right)=\dfrac{2}{3}\)
\(x\times1=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}\div1\)
\(x=\dfrac{2}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x * 5.2 : 4.5 = 10.4
x = 10.4 * 4.5 : 5.2
x = 9
b) 17.4 : x * 5.3 = 36.888
17.4 : x = 36.888 : 5.3
17.4 : x = 6.96
x = 17.4 : 6.96
x = 2.5
a) X x 5,2 :4,5 = 10,4 b)17,4 : X x 5,3 = 36,888
X x 26/5 : 9/2 =52/5 87/5 : X x 53/10 = 4611/125
X x 52/45 =52/5 87/5 : X = 4611/125 : 53/10
X = 52/5 : 53/45 87/5 : X =174/25
X =9 X = 87/5 : 174 /125
vậy X=9 X =25/2
vậy X= 25/2
CHÚC BẠN HOK TỐT
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
X x 5,2 : 4,5 = 10 ,5
X x 5,2 = 10,5 x 4,5
X x 5,2 = 47,25
X = 47,25 : 5,2
X = 945/104
b)
5/7 x X + 2/7 x X = 2/3
X x ( 5/7 + 2/7 ) = 2/3
X x 1 = 2/3
x = 2/3 : 1
x = 2/3
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
X x5.2:4.5=10.4
X x5.2=10.4x4.5
X x5.2=46.8
X=46.8:5.2
X=9
Vậy X=9
![](https://rs.olm.vn/images/avt/0.png?1311)
mk ko viết lại đề nhé!
=>x . 5,2 =10,4 . 4,5
=>x . 5,2 = 46,8
=>x=9
Vậy x=9
CHÚC BN HỌC TỐT
NHỚ TK MK NHA
x.5,2:4,5=10,4 =>x.5,2 =10,4.4,5 =>x.5,2 =46,8 =>x =46,8:5,2 =>x =9
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x + 30%x = -1,31
(1 + 30%)x = -1,31
13/10x = -1,31
x = -1,31 : 13/10
x = -131/130
b) (x - 1/2) : 1/33 + 5/7 = 68/7
(x - 1/2) : 1/33 = 68/7 - 5/7
(x - 1/2) : 1/33 = 9
(x - 1/2) = 9 x 1/33
x - 1/2 = 3/11
x = 3/11 + 1/2
x = 17/22
c) (4,5 - 2x) . ( -11) = 11/14
(4,5 - 2x) = 11/14 : (-11)
(4,5 - 2x) = -1/14
2x = 4,5 + 1/14
2x = 32/7
x = 16/7
a,x + 30%x = -1,31
x.130%= -1,31
x = -131/130
b, (x-1/2) : 1/33 + 5/7 = 68/7
(x-1/2) . 33 = 68/7 -5/7
(x-1/2).33 = 9
x-1/2 = 9:33
x-1/2 = 3/11
x = 3/11 + 1/2
x =17/22
c,(4,5 - 2x).(-11) = 11/14
4,5 - 2x = 11/14 : (-11)
4,5 - 2x = -1/14
2x = 4,5 -(-1/14)
2x = 32/7
![](https://rs.olm.vn/images/avt/0.png?1311)
1. a
\(\dfrac{8}{5}-\dfrac{5}{6}\cdot\dfrac{3}{4}\)
\(=\dfrac{8}{5}-\dfrac{5\cdot3}{3\cdot2\cdot4}\)
\(=\dfrac{8}{5}-\dfrac{5}{8}=\dfrac{39}{40}\)
1.b
\(=\dfrac{7}{8}+\dfrac{5}{6}\cdot\dfrac{3}{2}\)
\(=\dfrac{7}{8}+\dfrac{5\cdot3}{3\cdot2\cdot2}\)
\(=\dfrac{7}{8}+\dfrac{5}{4}=\dfrac{17}{8}\)
2.a
\(\dfrac{4}{5}+x=\dfrac{11}{10}\)
\(x=\dfrac{11}{10}-\dfrac{4}{5}=\dfrac{3}{10}\)
2.b
\(x-\dfrac{3}{4}=\dfrac{5}{7}\)
\(x=\dfrac{5}{7}+\dfrac{3}{4}=\dfrac{41}{28}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 105,6 - x = 29,04
x = 105,6 - 29,04
x = 76,56
b) x : 7 = 4,5 × 3
x : 7 = 13,5
x = 13,5 × 7
x = 94,5
c) Sửa đề: x × 2,8 + x × 5,2 = 48
x × (2,8 + 5,2) = 48
x × 8 = 48
x = 48 : 8
x = 6
d) Sửa đề:
x × 12,25 + x × 2,75 = 1050
x × (12,25 + 2,75) = 1050
x × 15 = 1050
x = 1050 : 15
x = 70
a) \(105,6-x=29,04\)
\(x=105,6-29,04\)
\(x=76,2\)
b) \(x:7=4,5x3\)
\(x:7=13,5\)
\(x=13,5x7\)
\(x=94,5\)
c) Bạn xem lại đề
d) Bạn xem lại đề
a) X*5,2 : 4,5 =10,4
X*5,2=10,4*4,5
X*5,2=46,8
X =46,8:5,2
X =9
b) 5/7*x+2/7*x=2/3
(5/7+2/7)*x=2/3
1*x =2/3
x =2/3:1
x =2/3