\(3^2\cdot5^2-\left\{4^3\cdot25-3\cdot\left[3\left(17+3\right)^3-7\cdot10^2\right]\right\}\\ =9\cdot25-\left\{64\cdot25-3\cdot\left[3\cdot20^3-700\right]\right\}\\ =225-\left\{1600-3\left[24000-700\right]\right\}\\ =225-\left\{1600-3\cdot23300\right\}\\ =225--68300=68525\)
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