Tính
a) - ( 231 + 16 - 75 ) + ( 25 - 9 )
b) - ( - 231 + 17 ) - ( 54 + 23 )
c) - [ ( - 25 ) - 7 + ( 8 - 16 ) ] - [ ( - 21 + 3 ) - 7 ]
d) - ( - a - b - c ) + ( - c - b + a )
e) ( - 26 ) - [ - ( 18 - 6 + 7 ) + ( 8 - 9 ) ]
Làm ơn giúp mình nhanh với , help
a) - ( 231 + 16 - 75 ) + ( 25 - 9 )
= - 231 - 16 + 75 + 25 - 9
= - 247 + 100 - 9
= -147 - 9
= -156
b) - ( - 231 + 17 ) - ( 54 + 23 )
= 231 + 17 - 54 - 23
= 248 - 31
= 217
c) - [ ( - 25 ) - 7 + ( 8 - 16 ) ] - [ ( - 21 + 3 ) - 7 ]
= - [-32 + (-8) ] - [ -18 - 7]
= - (-40) - (-25)
= 40 + 25
= 65
d) - ( - a - b - c ) + ( - c - b + a )
= a + b + c - c - b + a
= a+ b + 0 - b + a
= a + a + b - b
= a + a + 0
= 2a
e) ( - 26 ) - [ - ( 18 - 6 + 7 ) + ( 8 - 9 ) ]
= -26 - [ -18 + 6 - 7 + 8 - 9]
= -26 - (-20)
= -26 + 20
= -6