Đơn giản biểu thức khi bỏ ngoặc :
a) (a+b-c)-(b-c+d) b)-(a-b+c)+(a-b+d)
c) (a+b)-(-a+b-c) d) -(a+b)+(a+b+c)
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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 - c2 - d
b)- (a - b + c) + (a - b + d)
=-a + b - c + a - b + d
=(-a + a) + (b - b) - c + d
=0 + 0 - c + d
c) -(a + b) - (-a - b + c)
=-a - b + a + b - c
=(-a + a) - (b + b) - c
=0 - b2 - c
d)(a - b) - (c - d) - (a - c)
=a - b - c + d - a + c
=(a - a) - b - (c + c) + d
=0 - b - c2 + dd
Mỏi cả tay😧
1) Đơn giản biểu thức SAU khi bỏ dấu ngoặc:
a) - a - (b - a - c) = -a - b + a + c = -b + c
b) - (a - c) - (a - b - c) = - a + c - a + b + c = - 2a + 2c + b
c) b - (b + a - c) = b - b - a + c = - a + c
d) - (a - b - c) - (a + b + c) = -a + b + c - a - b - c = -2a
a) \(-a-\left(b-a-c\right)=-a+b+a+c=b+c\)
b) \(-\left(a-c\right)-\left(a-b-c\right)=-a+c-a+b+c=-2a+2c+b\)
c) \(b-\left(b+a-c\right)=b-b-a+c=-a+c\)
d) \(-\left(a-b-c\right)-\left(a+b+c\right)=-a+b+c-a-b-c=-2a\)
#Trl :
\(A=-a-\left(b-a-c\right)\)
\(A=-a-b+a+c\)
\(A=-b+c\)
-------------------
\(B=-\left(a-c\right)-\left(a-b+c\right)\)
\(B=-a+c-a+b-c\)
\(B=-2a+b\)
--------------------
\(C=b-\left(a+b-c\right)\)
\(C=b-a-b+c\)
\(C=-a+c\)
-------------------
\(D=-\left(a-b+c\right)-\left(a+b-c\right)\)(đoạn này cậu đánh nhầm dấu ) thành số 0 nè )
\(D=-a+b-c-a-b+c\)
\(D=-2a\)
( a-b+c ) - ( d+c-b )
= a - b + c - d - c + b
= a + (-b) + c + (-d) + (-c) + b
= a + (-d) + [ (-b) + b ] + [ (-c) + c ]
= a + (-d) + 0 + 0
= a + (-d)
Chúc bạn hk tốt
a) (a+b-c)-(b-c+d)
= a+b-c - b+c-d
= (b-b)+(c-c)+a-d
= 0+0+a-d
= a-d
b) -(a-b+c)+(a-b+d)
= -a+b-c + a-b+d
= (a-a) + (b-b) - c + d
= 0 + 0 - c + d
= - c + d
a) -(a - c) - (a - b + c)
= a + c - a + b - c
= (a - a) + (c - c) + b
= 0 + 0 + b
= b
b) -a - (b - a - c) + b
= -a - b + a + c + b
= (-a + a) + (b + b) + c
= 0 + 2b + c
= 2b + c
c) -(a - b + c) - (a + b + c)
= a + b - c - a - b - c
= (a - a) + (b - b) + (c - c)
= 0 + 0 + 0
= 0
d) (a + b) - (a - b) + (a - c) - (a - c)
= a + b - a + b + a - c - a + c
= (a - a + a - a) + (b + b) + (c + c)
= 0 + 2b + 2c
= 2b + 2c
e) (a + b - c) + (a - b + c) - (b + c - a) - (a - b - c)
= a + b - c + a - b + c - b - c + a - a + b + c
= (a + a + a - a) + (b - b - b + b) + (c + c - c + c)
= 2a + 0 + 2c
= 2a + 2c
\(\left(a-b+c\right)-\left(a-b+c\right)\)
\(=a-b+c-a+b-c\)
\(=\left(a-a\right)+\left(-b+b\right)+\left(c-c\right)=0\)
\(-\left(a-b-c\right)+\left(a-b-c\right)\)
\(=-a+b+c+a-b-c\)
\(=\left(-a+a\right)+\left(b-b\right)+\left(c-c\right)=0\)
\(\left(a+b-c\right)-\left(b-c+d\right)\)
\(=a+b-c-b+c-d\)
\(=a+\left(b-b\right)+\left(-c+c\right)-d=a-d\)
\(\left(a-b+c\right)-\left(a-d+c\right)\)
\(=a-b+c-a+d-c\)
\(=\left(a-a\right)+\left(c-c\right)+d-b=d-b\)
\(-\left(a-b-c\right)+\left(a-b+c\right)\)
\(=-a+b+c+a-b+c\)
\(=\left(-a+a\right)+\left(b-b\right)+\left(c+c\right)=2c\)
Ủng hộ mk nha !!! ^_^
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
\(\text{a/ (a+b+c)-(b-c+d)}\)
\(\text{= a+b+c-b+c-d}\)
\(\text{=(b-b)+(c-c)+(a-d)}\)
\(\text{=a-d}\)
\(\text{b/ -(a+b-c)-(a-b+d)}\)
\(\text{= -a-b+c-a+b-d}\)
\(\text{=(b-b)+(-a+a)+(d-c)}\)
\(\text{=d-c}\)
\(\text{c/(a+b)-(-a+b-c)}\)
\(\text{=a+b-a-b+c}\)
\(\text{=(a+a)+(b-b)-c}\)
\(\text{=2a-c}\)
\(\text{d/ -(a+b)+(a+b+c)}\)
\(\text{= -a-b+a+b+c}\)
\(\text{=(-a+a)+(b-b)+c}\)
\(=c\)