Question

 

30+12+(-20)+(-12)

(-17)+5+8+17=?

Answer 1

30 + 12 + ( - 20 ) + ( - 12 )

= 30 + 12 - 20 - 12

= 42 - 20 - 12

= 22 - 12

= 10

Answer 2

30 + 12 + (-20) + (-12) = 10

(-17) + 5 + 8 + 17 = 13

Answer 3

10

13

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Answer 4

a ) 30 + 12 + ( - 20 ) + ( - 12 )

= [ 30 + ( - 20 ) ] + [ 12 + ( - 12 ) ]

= 10 + 0

= 10

b ) ( - 17 ) + 5 + 8 + 17

= ( 5 + 8 ) + [ ( - 17 ) + 17 ]

= 13 + 0 

= 13