a) - 5 + 6 - ( - 6) + 7 - ( -8)
= - 5 + 6 + 6 + 7 + 8
= 22
b) 9 + ( - 6) + ( - 6) - ( - 5)
= 9 - 6 - 6 + 5
= 2
c) 8 . 2 + ( - 10) . ( - 9)
= 8×2 + ( - 10) × ( - 9)
= 16 + ( - 10)(-9)
= 16 +(90)
= 16 + 90
= 106
d) (-12).( - 15) - 8 . ( - 8)
= (-12)×(- 15) - 8×(-8)
= (180)-8(-8)
= 180+64
= 244
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a) - 5 + 6 - ( - 6) + 7 - ( -8)
= - 5 + 6 + 6 + 7 + 8
= 22
b) 9 + ( - 6) + ( - 6) - ( - 5)
= 9 - 6 - 6 + 5
= 2
c) 8 . 2 + ( - 10) . ( - 9)
= 8×2 + ( - 10) × ( - 9)
= 16 + ( - 10)(-9)
= 16 +(90)
= 16 + 90
= 106
d) (-12).( - 15) - 8 . ( - 8)
= (-12)×(- 15) - 8×(-8)
= (180)-8(-8)
= 180+64
= 244