Question

CMR

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

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

 

Answer 1

a,a-b+c-d=a+c-b-d=(a+c)-(b+d)(đpcm)

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

Answer 2

a, Ta có (a-b) +(c-d) = a-b+c-d = (a+c)-(b+d)   ( ĐPCM)

b, Ta có (a-b)-(c-d) = a-b-c+d = ( a+d) - ( b+c)   ( ĐPCM )

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Answer 3

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

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

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

Answer 4

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

= a-b+c-d

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

= (a+c)-(b+d)(ĐPCM)

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

= a-b-c+d

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

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

Answer 5

a,

( a - b ) + ( c - d )

= a - b + c - d

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

b,

( a - b ) - ( c - d )

= a - b - c + d

= ( a + d ) - ( b + c )      ( đpcm )