Tìm x hộ mình với : 145.7 - 290 : 5 + 0.3 / X : 8 + 13 = 4
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(x : 8 + 13 ) . 4 = 146 + 290 : 5
( x : 8 + 13 ) . 4 = 146 + 58
( x : 8 + 13 ) . 4 = 204
x : 8 + 13 = 204 : 4
x : 8 + 13 = 51
x : 8 = 51 - 13
x : 8 = 38
x = 38 x 8
x = 304
(x : 8 + 13) . 4 = 146 + 290 : 5
(x : 8 + 13) . 4 = 146 + 58
(x : 8 + 13) . 4 = 204
x : 8 + 13 = 51
x : 8 = 38
x = 304
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 305 - 5x = 290
5.(61-x) = 290
61-x = 58
x = 3
b) (3x - 24) .25 = 26
3x - 24 = 2
3x = 18
x=6
c) 8 + 3.(x-5)2 = 35
3.(x-5)2 = 27
(x-5)2 = 9 = 32 = (-3)2
=> x - 5 = 3 => x = 8
x-5 = - 3 => x = 2
KL:>.
d) 21 chia hết cho x - 2
\(\Rightarrow x-2\inƯ_{\left(21\right)}=\left\{\pm1;\pm3;\pm7;\pm21\right\}.\)
..
rùi bn tự lập bảng xét giá trị nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
1.
=3/5x(3/7+4/7)+2/5x(13/9-4/9)
=3/5x1+2/5x1
=3/5+2/5
=1
2.Xx(3/4+4/5)=7/10
Xx31/20=7/10
X =7/10:31/20
X =14/31
\(\frac{3}{5}\cdot\frac{3}{7}+\frac{3}{5}\cdot\frac{4}{7}+\frac{2}{5}\cdot\frac{13}{9}-\frac{2}{5}\cdot\frac{4}{9}\)
\(=\frac{3}{5}\cdot\left(\frac{3}{7}+\frac{4}{7}\right)+\frac{2}{5}\cdot\left(\frac{13}{9}-\frac{4}{9}\right)\)
\(=\frac{3}{5}\cdot1+\frac{2}{5}\cdot1\)\(=\frac{3}{5}+\frac{2}{5}=1\)
_________________________________________
\(\frac{3}{4}\cdot x+\frac{4}{5}\cdot x=\frac{7}{10}\)
\(\left(\frac{3}{4}+\frac{4}{5}\right)\cdot x=\frac{7}{10}\)
\(\frac{31}{20}\cdot x=\frac{7}{10}\)
\(x=\frac{7}{10}:\frac{31}{20}\)
\(x=\frac{14}{31}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{145,7-290:5+0,3}{x:8+13}=4\)
=> \(\frac{145,7-58+0,3}{x:8+13}=4\)
=> \(\frac{88}{x:8+13}=4\)
=> \(x:8+13=88:4\)
=> \(x:8+13=22\)
=> x : 8 = 9
=> x = 9 x 8 = 72
Vậy x = 72
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-4.\left(2x+9\right)-\left(-8x+3\right)-\left(x+13\right)=0\)
\(-8x-36+8x-3-x-13=0\)
\(-x-52=0\)
\(x=-52\)
k mk nha
thank you very much
145,7 - 290 : 5 + 0,3
__________________= 4
x : 8 + 13