能简算的要简算49×[2.4-（15+18）]14×1523-1.25×1523（11-115）÷（1-25×112）（34×0.75+34×0.25）÷67．-数学
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=0.25×15
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=（0.25-1.25）×15
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=-1×15
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=-15
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（3）（11-1
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（4）（
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=[（
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