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a,-b-(b-a+c)
=-b-b+a-c
=2*(-b)+a-c
b,-(a-b+c)-(c-a)
=-a+b-c-c+a
=(-a+a)+b-2*(-c)
=b-2*(-c)
c,b-(b+a-c)
=b-b-a+c
=0-a+c
d,a-(-b+a-c)
=a+b-a+c
=(a-a)+b+c
=b+c
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{a) -b-(b-a+c) }\)
\(=-b-b+a-c\)
\(=-2b+a-c\)
\(\text{ b) -(a-b+c)-(c-a)}\)
\(=-a-b-c-c+a\)
\(=\left(-a+a\right)+\left(-b\right)+\left(-c-c\right)\)
\(=-b+\left(-2c\right)\)
\(\text{c) b-(b+a-c)}\)
\(=b-b-a+c\)
\(=-a+c\)
\(\text{ d) a-(-b+a-c)}\)
\(=a+b-a+c\)
\(=\left(a-a\right)+b+c\)
\(=b+c\)
học tốt
a) -b-(b-a+c)
= −b − b + a − c
= −2b + a − c
b) -(a-b+c)-(c-a)
= −a − b − c − c + a
= −a + a + −b + −c − c
= −b + −2c
c) b-(b+a-c)
= b − b − a + c
= −a + c
d) a-(-b+a-c)
= a + b − a + c
= a − a + b + c
= b + c
![](https://rs.olm.vn/images/avt/0.png?1311)
a, A = ( -a - b + c) - ( -a - b - c)
= -a - b +c + a + b + c
= 2c
b, c = -2
=> A = 2.-2 = -4
Bạn có thể làm trình bày cho mình luôn được hông
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a) (a + b - c) - (b - c + d)
= a + b - c - b + c - d
= a + (b - b) - (c - c) - d
= a + 0 - 0 - d
= a - d
b) -(a + b + c) + (a - b + d)
= -a - b - c + a - b + d
= (-a + a) + (-b - b) - c + d
= -2b - c + d
câu c) tương tự nhé!! 34656654745756876876457567568687687698798363645765756
a) (a + b - c) - (b - c + d)
= a + b - c - b + c - d
= a - d
b) -(a - b + c) + (a - b + d)
= -a + b - c + a - b + d
= -c + d
= d - c
c) (a + b) - (-a + b - c)
= a + b + a - b + c
= 2a + c
![](https://rs.olm.vn/images/avt/0.png?1311)
đơn giản biểu thức:
-(a-b+c)-(c-a)=-a+b-c-c+a=b-2c
b-(b+a-c)=b-b-a+c=-a+c=c-a
a-(-b+a-c)=a+b-a+c=b+c
a,\(-\left(a-c\right)-\left(a-b+c\right)\)
\(=-a+c-a+b-c\)
\(=b\)
b,\(b-\left(b+a-c\right)\)
\(=b-b-a+c\)
\(=-a+c\)
c,\(-\left(a-b+c\right)-\left(a+b+c\right)\)
\(=-a+b-c-a-b-c\)
\(=-2a-2c\)
\(=-2\left(a+c\right)\)
a ) - ( a - c ) - ( a - b + c )
= - a + c - a + b - c
= [ ( - a ) + a ] + ( c - c ) + b
= 0 + 0 + b
= b
b ) b - ( b + a - c )
= b - b - a + c
= ( b - b ) + [ ( - a ) + c ]
= 0 + ( - a ) + c
= ( - a ) + c
c ) - ( a - b + c ) - ( a + b + c )
= - a + b - c - a - b - c
= (- 2a ) + ( b - b ) + ( - 2c )
= ( - 2a ) + 0 + ( - 2c )
= ( - 2a ) + ( - 2c )
= - 2 ( a + c )