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a)\(-\left(a-c\right)-\left(a-b+c\right)\)
\(=-a+c-a+b-c\)
\(=\left(-a-a\right)+\left(c-c\right)+b\)
\(=-2a+b=0\)
\(-2a=b\)
b)\(-\left(a-b+c\right)-\left(a+b+c\right)\)
\(=-a+b-c-a-b-c\)
\(=\left(-a-a\right)+\left(b-b\right)+\left(-c-c\right)\)
\(=-2a+0=-2c\)
\(=-2a+-2c\)
c)\(\left(a+b\right)-\left(a-b\right)+\left(a-c\right)-\left(a+c\right)\)
\(=a+b-a+b+a-c-a-c\)
\(=\left(a-a+a-a\right)+\left(b+b\right)+\left(-c-c\right)\)
\(=0+2b+\left(-2c\right)\)
\(=2b+\left(-2c\right)\)
d)\(\left(a+b-c\right)+\left(a-b+c\right)-\left(b+c-a\right)-\left(a-b-c\right)\)
\(=a+b-c+a-b+c-b-c+a-a+b+c\)
\(=\left(a+a+a-a\right)+\left(b-b-b+a\right)+\left(-c+c-c+c\right)\)
\(=2a+0+0\)
\(=2a\)
a)-(a-c)-(a-b+c)
=-a+c-a+b-c
=-2a+b
b)-(a-b+c)-(a+b+c)
=-a+b-c-a-b-c
=-2a-2c
=-2(a+c)
c)(a+b)-(a-b)+(a-c)-(a+c)
=a+b-a+b+a-c-a-c
=2b-2c
=2(b-c)
d)(a+b-c)+(a-b+c)-(b+c-a)-(a-b-c)
=a+b-c+a-b+c-b-c+a-a+b+c
=2a
a: A\B={7}
B\A={3}
b: A\B=\(\varnothing\)
B\A={-3;7}
c: A\(\cap\)B=\(\varnothing\)
A\(\cup B\)=(-12;8]
A\B=(-12;5)
B\A=[5;8]
a/ \(A\cap B=\left[1;4\right]\); \(A\cap B=\left[-4;7\right]\); \(A\ B=[-4;1)\)
b/\(A\cap B=\varnothing\) ; \(A\cup B=\left[-4;-2\right]\cup\left(3;7\right)\) ; \(A\ B=A\)
c/ \(A\cap B=\varnothing\) ; \(A\cup B=(-\infty;-2]\cup[3;+\infty)\)
d/ \(A\cap B=[3;4)\) ; \(A\cap B=\left(0;+\infty\right)\); \(A\backslash B=[4;+\infty)\)
a-b=a+b
Trả lời :
a - b = -a + b
~HT~
Của mk ms đúng