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> 今年以来受各种因素的影响,猪肉的市场价格仍在不断上升。据调查,今年5月份一级猪肉的价格是1月份一级猪肉价格的1.25倍,小英同学的妈妈同样用20元钱在5月份购得一级猪肉比-八年级数学
今年以来受各种因素的影响,猪肉的市场价格仍在不断上升。据调查,今年5月份一级猪肉的价格是1月份一级猪肉价格的1.25倍,小英同学的妈妈同样用20元钱在5月份购得一级猪肉比-八年级数学
题目简介
今年以来受各种因素的影响,猪肉的市场价格仍在不断上升。据调查,今年5月份一级猪肉的价格是1月份一级猪肉价格的1.25倍,小英同学的妈妈同样用20元钱在5月份购得一级猪肉比-八年级数学
题目详情
今年以来受各种因素的影响,猪肉的市场价格仍在不断上升。据调查,今年5月份一级猪肉的价格是1月份一级猪肉价格的1. 25倍,小英同学的妈妈同样用20元钱在5月份购得一级猪肉比在1月份购得的一级猪肉少0.4斤,那么今年1月份的一级猪肉每斤是多少元?
题型:解答题
难度:中档
来源:不详
答案
设今年1月份的一级猪肉价格是每斤x元,(1分)
根据题意得:
=0.4(4分)
解得:x=10(元)(7分)
经检验得:x=10是原方程的解.(8分)
答:今年1月份的一级猪肉价格是每斤10元.
求的是单价,总价明显,一定是根据数量来列等量关系,本题的关键描述语是:用20元钱在5月份购得一级猪肉比在1月份购得的一级猪肉少0.4斤,等量关系为:原来20元能买的斤数-现在20元能买的数量=0.4.
上一篇 :
解方程:2(x+1)2x2-x+1x-1=0-数
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题目简介
今年以来受各种因素的影响,猪肉的市场价格仍在不断上升。据调查,今年5月份一级猪肉的价格是1月份一级猪肉价格的1.25倍,小英同学的妈妈同样用20元钱在5月份购得一级猪肉比-八年级数学
题目详情
答案
根据题意得:
解得:x=10(元)(7分)
经检验得:x=10是原方程的解.(8分)
答:今年1月份的一级猪肉价格是每斤10元.