Question

plzzzz cine ma poate ajuta la un exerciti la matematica ​

Answer 1

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

= ( - 2 - 3 ) + [- 2 - ( - 7)] - [ + 3 - ( - 7 )]

= - 5 + [ - 2 + 7 ] - [ 3 + 7 ]

= - 5 + 5 - 10

= 0 - 10

= - 10

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

= ( - 2 - 3 ) + ( - 7 ) - [ - 2 + ( - 7 )]

= - 5 + ( - 7 ) - ( - 9 )

= - 12 - ( - 9 )

= - 12 + 9

= - 3

d) [( a - c ) - b ] - a =

= {[( - 2 ) - ( - 7 )] - 3 } - ( - 2 )

= {[( - 2 ) + 7 ] - 3 } - ( - 2 )

= ( 5 - 3 ) - ( - 2 )

= 2 - ( - 2 )

= 2 + 2

= 4