Question

a) 1125-(374+1125)+(-65+374)\

b)-23.65+23.21-58.23

c)-2003+(-21+75+2003)

d)942-2567+2563-1942

e)12-12+11+10-9_8-7+5-4+3+-1

Answer 1

a, -65

b, -2277

c, 54

d,-1004

e,0

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Answer 2

a) 1125 - ( 374 + 1125 ) + ( - 65 + 374 )

= 1125 - 374 - 1125 - 65 + 374

= ( - 1125 + 1125 ) + ( - 374 + 374 ) - 65

= - 65

b) - 23 . 65 + 23 . 21 - 58 . 23

= 23 . ( - 65 + 21 -  23 )

= 23 . ( - 67 ) 

= - 1541

c) - 2003 + ( - 21 + 75+ 2003 )

= - 2003 + 2057 

= 54

d) 942 - 2567 + 2563 - 1942

= - 1625 + 621

= - 1004

e) 12 - 12 + 11 + 10 - 9 _ 8- 7 + 5 - 4 + 3 + -1

= 0