Question

Thu gọn biểu thức 

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

Answer 1

Bài làm 

\(a\left(b-c-d\right)-b\left(c+a\right)=ab-ac-ad-bc-ba\)

\(=-ac-ad-bc\)

Answer 2

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

=a.b-a.c-a.d-b.c-b.a

= -a.c-c.d-b.c

Answer 3

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

\(=ab-ac-ad-bc-ba\)

\(=\left(ab-ba\right)-ac-ad-bc\)

\(=-ac-ad-bc\)

Học tốt

Answer 4

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

= ab - ac - ad - bc + ab

= -ac - ad - bc

Answer 5

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

\(=ab-ac-ad-bc-ba\)

\(=-ac-ad-bc\)

Answer 6

a ( b - c - d ) - b ( c + a ) = ( ab - ac - ad ) - ( bc + ba )

                                       = ab - ac - ad - bc - ba

                                       = ( ab - ba ) - ac - ad - bc

                                       = -ac - ad - bc