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30×(500―400÷25﹚的简便方法算法是啥?

30×(500-400÷25﹚ =30×(500-16) =30×500-30×16 =15000-480 =14520

(400-x÷8)x25=500 解:10000-25x/8=500 80000-25x=4000 25x=80000-4000 x=76000÷25 ×=3040

618-(352-282) =618+282-352 =900-300-52 =548。

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