题目内容
【题目】(4分)(78.6﹣0.786×25十75%×21.4)÷15×1997.
【答案】9985.
【解析】
试题分析:可将算式1997改写成2000减3,然后用乘法分配律进行计算.
解:(78.6﹣0.786×25十75%×21.4)÷15×1997
=(78.6﹣19.65+0.75×21.4)÷15×(2000﹣3),
=(78.6﹣19.65+16.05)÷15×(2000﹣3),
=(58.95+16.05)÷15×(2000﹣3),
=75÷15×(2000﹣3),
=5×(2000﹣3),
=5×2000﹣5×3,
=10000﹣15,
=9985.
故答案为:9985.
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