Question

2+[2+4_{2×5_(4×2×3-4-3)}]
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Answer 1

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= 2+[2+4{2×5(4×2×3-4-3)}]

= 2+[2+4{2×5(24-4-3)}]

= 2+[2+4{2×5×17}]

= 2+[2+4×170]

= 2+[2+680]

= 2+682

= 684.