(x - 3)y+2x -26=37
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Rin sẽ làm bài 2
a. 4 - 2x = -56
2x = 4 + 56
2x = 60
x = 30
b. -9x + 42 = 66
-9x = 24
x = 24 : -9
x = \(\frac{-24}{9}\)
c. 5 x 1x - 111 = 125
1x - 111 = 25
1x = 136
x = 136
d. (2x +1)2 = 81
(2x +1)2 = 92
=> 2x + 1 = 9
2x = 10
x = 5
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Bài 1:
\(a,=6x^2+19x-7-6x^3-4x^2+7x=-6x^3+2x^2+26x-7\\ b,B=26\cdot\left(63^2+63\cdot37+37^2\right):26+63\cdot37\\ =63^2+63\cdot37+37^2+63\cdot37\\ =\left(63+37\right)^2=100^2=10000\)
Bài 2:
\(a,=x\left(y^2-25\right)=x\left(y-5\right)\left(y+5\right)\\ b,=\left(x-y\right)\left(x+2\right)\\ c,=\left(x-3\right)\left(x^2-4\right)=\left(x-2\right)\left(x-3\right)\left(x+2\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
7+2x=-37-(-26)-x
7+2x=-11-x
7+2x+x=-11
7+3x=-11
3x=-11-7
3x=-18
x=-18:3
x=-6
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
c: \(=x^2\left(x-3\right)-4\left(x-3\right)\)
\(=\left(x-3\right)\left(x-2\right)\left(x+2\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
2x - 15 = -11 - ( -16 )
2x - 15 = -11 + 16
2x - 15 = 5
2x = 5 + 15
2x = 20
x = 20 : 1
x = 10
Vậy x = 10
7 - 2x = -37 - ( -26 )
7 - 2x = -37 + 26
7 - 2x = -11
2x = 7 - ( - 11 )
2x = 7+ 11
2x = 18
x = 18 : 2
x = 9
Vậy x = 9
| x + 7 | = 9
TH1 :
x + 7 = 9
=> x = 9 - 7
=> x = 2
TH2 :
x - 7 = -9
=> x = -9 - 7
=> x = - 9 + ( -7 )
=> x = -16
Vậy x = 2 và x = -16
Câu cuối bn tự làm nha! ^-^
2x-15=-11-(-16)
2x-15= -11+16
2x-15=5
2x=5+15
2x=20
x=20:2
x=10
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
-7-2x = 37-(-26)
Suy ra -7-2x=11
Suy ra -2x=11-7
Suy ra -2x=4
Suy ra 2x= -4
Suy ra x = -4 :2 =-2