Question

cho :
A= a+b+5 B= b-c-9
C= b-c-4 D= -b-a
Chứng minh A+B = C-D

Answer 1

Ta có :\(\text{VT = A + B}\)

\(\text{= ( a + b + 5 ) + ( b – c – 9 )}\)

\(\text{= a + b + 5 + b – c – 9}\)

\(\text{= a + ( b + b ) – c + ( 5 – 9 )}\)

\(\text{= a + 2b – c – 4 (1)}\)

\(\text{VP = C – D}\)

\(\text{= ( b – c – 4 ) – ( -b – a )}\)

\(\text{= b – c – 4 + b + a}\)

\(\text{= ( b + b ) – c + a – 4}\)

\(\text{= 2b – c + a – 4}\)

\(\text{= a + 2b – c – 4 (2)}\)

\(\text{từ (1) và (2) suy ra}\)\(\text{ A + B = C – D ( đpcm ) }\)