a(b-c-d)-a(b+c-d)=a(b-c-d-b+c-d)=a[(b-b)-(c-c)-(d+d)]=2[0-2d]=2*(-2d)=2(1+d)

\(\left(a+b\right)\left(c-d\right)-\left(a-b\right)\left(c+d\right)\)

\(=\left(ac-ab+bc-bd\right)-\left(ac+ad-bc-bd\right)\)

\(=ac-ad+bc-bd-ac-ad+bc+bd\)

\(=2bc-2ad\)

\(=2\left(bc-ad\right)\)

lộn=(a+b)²-(c+d)²

 (a+b+c+d).((a+b-c-d)= ((a+b)+(c+d)).((a+b)-(c+d))=(a+b)²-(a+b)²=0

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- (a + b - c) + (b - c + d) - (-a + b + d)

= -a -b + c + b - c + d + a - b - d

= -b 

\(A=\left(a-b-c-d\right)+\left(b-c+d-a\right)\)

\(=a-b-c-d+b-c+d-a\)

\(=-2c\)

giải hẳn ra giùm mik vs

-(a+b-c+d)+(a-b-c-d)=-a-b+c-d+a-b-c-d=(-a+a)-(b+b)+(c-c)-(d+d)=0-2b+0-2d=-2b+(-2)d=-2(b+d)

 -(a+b-c+d)+(a-b-c-d)

= -a-b+c-d+a-b-c-d

= -2b-2d

Nhấn đúng cho mk nha!!!!!!!!!!!

(a+b).(c+d)-(a+d).(b+c)

=(-c-b).d+b.c+b^2

(a+b).(c+d)-(a+d).(b+c)

=ac+ad+bc+bd-ab-ac-bd-dc

=(ac-ac)+(bd-bd)+(ad-ab)+(bc-dc)

=0+0+a.(d-b)+c.(b-d)

=a.(d-b)+c.(b-d)

Hok tốt

\(\left(a+b\right)\left(c+d\right)-\left(a+d\right)\left(b+c\right)\)

\(=ac+ad+bc+bd-ab-ac-db-dc\)

\(=ad+bc-ab-dc\)

\(=\left(ad-ab\right)+\left(bc-dc\right)\)

\(=a\left(d-b\right)+c\left(b-d\right)\)

\(=a\left(d-b\right)-c\left(d-b\right)\)

\(=\left(a-c\right)\left(d-b\right)\)

A=a.(b+c)-b.(a+c)

=ab+ac-ba+bc

=ac+bc

=c.(a+b)

a) = a - b + c - d - a - b - c - d

= -2b - 2d

b) = -a + b - c + a - b - a + b + c

= -a + b

c) = -a + b + c + b - c + d + a - b - d

= b 

a,= -2b - 2d

b,=-a + b

c,=b

a) = a - b + c - d - a - b - c - d

= -2b - 2d

b) = -a + b - c + a - b - a + b + c

= -a + b

c) = -a + b + c + b - c + d + a - b - d

= b