解法1:
250+616/28*15
=250+(560+56)/28*15
=250+(20+2)*15
=250+300+30
=580
解法2：
250+616÷28x15
=250+22x15
=250+330
=580
解法3：
250+616➗28x15
=250+616➗7➗4x15
=250+88➗4x15
=250+22x15
=250+22x5x3
=250+110x3
=250+330
=580
解：250+616/28*15
=250+(560+56)/28*15
=250+(20+2)*15
=250+300+30
=580
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