下面各题，怎样简便就怎样算．12÷0.4÷34517÷9+19×51749÷[（56-12）+（59-518）]24×（38+16+512）80×18÷1800×18001.8×34+1.2×34-34．-数学
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（3）
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（4）24×（
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