Question

Chứng tỏ

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

Answer 1

a(b - c) + a(d + c) 

= ab - ac + ad + ac

= ab + ad + (-ac + ac)

= ab + ad

= a.(b + d) 

Answer 2

a(b - c) + a(d + c) 

= ab - ac + ad + ac

= ab + ad + (-ac + ac)

= ab + ad

= a.(b + d) 

Answer 3

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

\(\Leftrightarrow\)ab-ac+ad+ac=a(b+d)

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

\(\Leftrightarrow\)a(b+d)=a(b+d) (đpcm)

Answer 4

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

phân tích vế trái ta có:

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

= ab - ac + ad + ac

= ab + ad

= a(b + d) = vế phải a( b + d)

vậy a(b-c) + a(d + c) = a(b + d)

Answer 5

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

=a(b-c+d+c)

=a(b+d-c-c)

=a(b+d) Vì c-c= 0

k cho mik nha