Question

Chứng minh rằng : 

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

Answer 1

Ta có : VT = a x ( b - c ) + a x ( d + c ) 

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

                = a x ( b + d ) = VP

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

k mk nha bn

thank you very much 

Answer 2

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

=> ab - ac + ad + ac = a(b + d)

=> (ab + ad) + (-ac + ac) = a(b + d)

=> ab + ad + 0 = a(b + d)

=> ab + ad = a(b + d)

Answer 3

Thanks cậu =)))