Answer:
(i) - 33 × 99
= - 3267
(iii) 53 × ( - 9) - ( - 109) × 53
= - 477 + 109 × 53
= - 477 + 5777
= + 5300
(ii) (-85) × 43 + 43 × ( - 15)
= - 3655 + 43 - 645
= - 3655 - 645 + 43
= - 4300 + 43
= - 4257
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