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![](https://rs.olm.vn/images/avt/0.png?1311)
=>(-12x)-(-60)+21-7x=5
=>(-12x)+60+21-7x=5
=>(-12x-7x)=5-(60+21)=-76
=>(-19x)=-76=>x=4
Vậy x=4
-12(x-5)+7(3-x)=5
-12.x+12.5+7.3-7.x
-19x+60+21=5
-19x=-76
x=-76:(-19)=4
Vậy x=4
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(x+\left(-81\right)-\left(11-81\right)=x-81-11+81=x-11\)
b) \(\left(-1-x+2\right)+1=\left(-1\right)-x+2+1=-x+2=2-x\)
c) \(15-\left(11-x\right)+\left(11-15\right)=15-11-x+11-15\)
\(=\left(15-15\right)+\left(11-11\right)+x=0+0+x=x\)
d) \(15-\left(15-x+202\right)=15-15+x-202=x-202\)
a)x-81-11+81=x-11
b)(-1-x+2)+1=-1-x+2+1=2-x
c)15-(11-x)+(11-15)=15-11+x+11-15=x
d)15-(15-x+202)+202=15-15+x-202+202=x
![](https://rs.olm.vn/images/avt/0.png?1311)
x=(-59,-58,.......,60,61)
cho mình đúng nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a,4^8:X=4^6
X=4^8:4^6
X=4^2
b,12x-33=3^5
12x-33=243
12x=243+33
12x=276
12*X=276
X= 276:12
x=23
c,(5x+335):2=20^2
(5x+335):2=400
(5x+335)=400*2
(5x+335)=800
5*x+335=800
5*x=800-335
5*x=465
x=465:5
x=93
d, (x^2-10):5=3
x^2-10=3*5
x^2-10=15
x^2=15+10
x^2=25
x^2=5^2
vậy x=5
e,740:(x+10)=10^2 - 2*13
740:(x+10)=10^2-26
740:(x+10)=100-26
740:(x+10)=74
x+10=740:74
x+10=10
x=10-10
x=0
nhớ tik cho mik nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
nếu là (-1997*1996 + 1)/(-1995*1997 +1996) thì:
(-1997*1996+1)/(-1997*1995+1997-1)=(-1997*1996+1)/(-1997*1996-1)
=25-15+x-202+202=x+10