脱式计算，怎样简便就怎样算．23×1439+14×163914317-6.46-3.54113+1213×（52-13）313×34+1013÷433×（215+112）-14（123-125）÷（6-27）×427．-数学
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=
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=
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（4）
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（5）3×（
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=3×
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=
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