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15*(32-24:x)-230=70
15*(32-24:x)=70+230
15*(32-24:x)=300
32-24:x=300:15
32-24:x=20
24:x=32-20
24:x=12
x=24:12
x=2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(x:32+15\right):4=24\)
\(x:32+15=24.4\)
\(x:32+15=96\)
\(x:32=96-15\)
\(x:32=81\)
\(x=81.32\)
\(x=2592\)
Sửa bài
\(\left(x:32+15\right):4=24\)
\(x:32+15=24.4\)
\(x:32+15=6\)
\(x:32=6-15\)
\(x:32=-9\)
\(x=\left(-9\right).32\)
\(x=-288\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Tìm x εIN biết
a) 390 - (x-8) = 168:13
b) (x-140) : 7 = 27 - 24
c) x- 6 :2 - ( 48 - 24 ) :2 :6 - 3 = 0
d) x+5.2-(32+16.3:6-15)=0
b) \(\left(x-140\right):7=27-24\)
\(\left(x-140\right):7=3\)
\(x-140=21\)
\(x=161\)
vay \(x=161\)
c) \(x-6:2-\left(48-24\right):2:6-3=0\)
\(x-3-24:2:6-3=0\)
\(x-3-2-3=0\)
\(x-8=0\)
\(x=8\)
vay \(x=8\)
d) \(x+5.2-\left(32+16.3:6-15\right)=0\)
\(x+10-\left(32+8-15\right)=0\)
\(x+10-25=0\)
\(x-15=0\)
\(x=15\)
vay \(x=15\)
a) \(390-\left(x-8\right)=168:13\)
\(390-x+8=\frac{168}{13}\)
\(x+8=390-\frac{168}{13}\)
\(x+8=\frac{5070}{13}-\frac{168}{13}\)
\(x+8=\frac{4902}{13}\)
\(x=\frac{4902}{13}-8\)
\(x=\frac{4798}{13}\)
vay \(x=\frac{4798}{13}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, [ ( x + 32 ) - 15 : 5 ] = 48
( x + 32 ) - 3 = 48
x + 32 = 48 + 3
x + 32 = 51
x = 51 - 32
x = 19
b, [ ( x2 + 54 ) - 32 ] = 244
( x2 + 54 ) - 32 = 244
x2 + 54 = 244 + 32
x2 + 54 = 276
x2 = 276 - 54
x2 = 222
Vậy x không có kết quả
a)[(x+32)-15:5]=48
(x+32)-3 =48
x+32 =48+3
x+32 =51
x =51-32
x =19
b)[(x^2+54)-32]=244
x^2+54 =244+32
x^2+54 =276
x^2 =276-54
x^2 =222
câu b mk nghĩ là sai đề cx có thể là mk làm sai