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a) 2 * x - 138 = 8 * 9
2 * x - 138 = 72
2 * x = 210
x = 105
b) 231 - ( x - 6 ) = 1339 : 13
231 - x + 6 = 103
237 - x = 103
x = 134
c) 70 - 5 * ( x-3) = 45
5 * (x-3) = 25
x - 3 = 5
x = 8
cac phan con lai bn lm tuong tu nha
* 2*X-138=8*9
<=> 2*X-138=72
<=> 2*X=72+138
<=> 2*X=210
<=> X=210/2=105
*231-(X-6)=1339:13
<=> 231-(X-6)=103
<=> X-6=231-103
<=>X-6=128
<=>X=128+6=134
*70-5*(X-3)=45
<=>5*(X-3)=70-45
<=>5*(X-3)=25
<=>X-3=25/5
<=>X-3=5
<=>X=8
*10+2*X=16
<=>2*X=16-10
<=>2*X=6
<=>X=6/2=3
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.\left(17x-25\right)\div8+65=81\)
\(\left(17x-25\right):8=81-65\)
\(\left(17x-25\right):8=16\)
\(17x-25=16\times8\)
\(17x-25=128\)
\(17x=128+25\)
\(17x=153\)
\(x=153\div17\)
\(x=9.\)
\(b.720\div\left[41-\left(2x-5\right)\right]=8\times5\)
\(720\div\left[41-\left(2x-5\right)\right]=40\)
\(\left[41-\left(2x-5\right)\right]=720\div40\)
\(\left[41-\left(2x-5\right)\right]=18\)
\(2x-5=41-18\)
\(2x-5=23\)
\(2x=23+5\)
\(2x=28\)
\(x=28\div2\)
\(x=14.\)
\(c.231-\left(x-6\right)=1339\div13\)
\(231-\left(x-6\right)=103\)
\(x-6=231-103\)
\(x-6=128\)
\(x=128+6\)
\(x=134.\)
a) => ( 17x-25 ) : 8 = 16 => ( 17x -25 ) = 128 => 17x = 103 = >x = 103/7
![](https://rs.olm.vn/images/avt/0.png?1311)
a, (17x-25):8=81-65
(17x-25):8=16
17x-25=16:8
17x-25=2
17x=2+25
17x=27
x=27:17
x=27/17
b,720:[41-(2x-5)]=40
41-(2x-5)=720:40
41-(2x-5)=18
2x-5=41-18
2x-5=23
2x=23+5
2x=28
x=28:2
x=14
c,231-(x-6)=103
x-6=231-103
x-6=128
x=128+6
x=134
XEM LẠI GIÙM MÌNH BẠN NHA!
đề bài: (17x-25):8+65= 81
(17x-25):8=81-65=16
17x-25= 16 . 8= 128
17x = 128+25=153
x = 153:17=9
b, Đề bài 720:[41-(2x-5)]=8.5
720:[41-(2x-5)]=40
41-(2x-5)=720:40=18
2x-5=41-18=23
2x = 23+5=28
x = 28:2= 14
c, 231-(x-6)=1339:13=103
x-6=231-103=128
x= 128 + 6= 134
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a , 231 - (X - 6) = 169 : 13
231 - (X - 6) = 13
231 - 13 = X + 6
218 = X - 6
X = 218 +6
X = 224
b , 3 x X + 5 x X = 4 x 8
3 x X +5 x X = 32
(3 + 5) x X = 32
8 x X = 32
X = 32 : 8
X = 4
c , (X + 1) + (X + 3) (X + 5) + ... + (X + 19) = 197
X + (1 + 3 + 5 + ...+ 19) = 197
X + 100 = 197
X = 197 - 100
X = 97
a)231-(x-6)=169:13
231-(x-6)=13
231-13 =x-6
218 =x-6
x = 218+6
x =224
b)3xX+5xX=4x8
(3+5)xX = 32
X=32:8
X=4
c)
![](https://rs.olm.vn/images/avt/0.png?1311)
cho a bang 8 phan 11 nhan 13 cong 8 phan 13 nhan 15 cong ... cong 8 phan 19 nhan 21 va b bang 36 phan 231
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(y+1)+(y+4)+(y+7)+....+(y+31) = 231
=> (y+y+....+y) + (1+4+7+...+31) = 231
=> 11y + 276 = 231
=> 11y = 55
=> y = 5
Vậy y = 5
231 - ( y-6) = 1339 : 13
231 - ( y-6 ) = 103
y - 6 = 231 -103 =128
y = 128 + 6 134
231- (y-6) = 1339 : 13
=> 231 - (y-6) = 103
=> y- 6 = 231 - 103 = 128
=> y = 128 + 6
=> y = 134