(iv) 25 of [70 - {9 x 7 + (14 - 3 of 4)}]
(v) 40 + [80 + {(20 - 3) x 7}]
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Step-by-step explanation:
25×[70-{9×7+(14-3×4)}]
25×[70-{9×7+(14-12)}]
25×[70-{9×7+2}]
25×[70-{9×9}]
25×[81-70]
25×11
275
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