ch a,b,c E Z; A=a-b+c,B=-a+b+c. chung minh rang A va B la 2 so doi nhau
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1) (a - b)x - (b - a)y + a - b
= (a - b)x + (a - b)y + (a - b)
= (a - b)(x + y + 1)
2) (x - y + z)a + (y - x - z)b - x + y - z
= (x - y + z)a - (x - y + z)b - (x - y + z)
= (x - y + z)(a - b - 1)
3) (2a + 3)x - 2ay - 3y + 2a + 3
= (2a + 3)x - (2a + 3)y + (2a + 3)
= (2a + 3)(x - y + 1)
4) (a - b)x + by - ay - a +b
= (a - b)x - (a - b)y - (a - b)
= (a - b)(x - y - 1)
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a) \(A=\left\{-6;-5;-4;-3;-2\right\}\)
b) \(B=\left\{-4;-3;-2;-1;0;1;2\right\}\)
c) \(C=\left\{-7;-6;-5;-4;-3;-2-1\right\}\)
d) \(D=\left\{-2;-1;0;1;2;3;4;5;\right\}\)
a, A= (-6;-5;-4;-3;-2)
b,B=(-4;-3;-2;-1;0;1;2)
c, C=(-7;-6;-5;-4;-3;-2;-1)
d,D=(-2;-1;0;1;2;3;4;5)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,5x^2-x=x\left(5x-1\right)\)
\(b,z^3-z^2+z=z\left(z^2-z+1\right)\)
\(c,a\left(a-2\right)+a-2=\left(a-2\right)\left(a+1\right)\)
\(d,12m\left(2-n\right)-18n\left(n-2\right)\)
\(=12m\left(2-n\right)+18n\left(2-n\right)\)
\(=6\left(2-n\right)\left(2m+3n\right)\)
\(e,\left(x^2-4x\right)+\left(12x-48\right)\)
\(=x\left(x-4\right)+12\left(x-4\right)\)
\(=\left(x-4\right)\left(x+12\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
A: Cu
B: H2SO4
C: CuSO4
D: SO2
E: H2O
G: Cl2
X: HCl
Y: CuCl2
Z: Fe
T: FeCl2
PT : Cu+ H2SO4(đ, to) -----> CuSO4+ SO2+ H2
SO2+ 2H2O+ Cl2 ------> 2HCl+ H2SO4
BaCl2+ CuSO4 ------> CuCl2+ BaSO4
Fe+ CuCl2 -------> FeCl2+ Cu
2FeCl2+ Cl2 -------> 2FeCl3 (Đk: to)