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>>>根据如图所示的程序计算,若输入的数为1,求输出的数.-七年级数学..
根据如图所示的程序计算,若输入的数为1,求输出的数.
题型:计算题难度:中档来源:江苏省期末题
解:12×2﹣4=2﹣4=﹣2<0,(﹣2)2×2﹣4=8﹣4=4>0.故输出的数为4.
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据魔方格专家权威分析,试题“根据如图所示的程序计算,若输入的数为1,求输出的数.-七年级数学..”主要考查你对&&代数式的求值&&等考点的理解。关于这些考点的“档案”如下:
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因为篇幅有限,只列出部分考点,详细请访问。
代数式的求值
代数式的值:用数值代替代数式的字母,按照代数式指明的运算,计算出结果才,叫做代数式的值。 代数式求值的步骤:(1)代入;(2)计算。常用的代入方法有直接代入法与整体代入法。注:代数式的值的取值条件:(1)不能使代数式失去意义;(2)不能使所表示的实际问题失去意义。求代数式的值的方法:①给出代数式中所有字母的值,该类题一般是先化简代数式,再代入字母的值,然后计算。②给出代数式中所含几个字母之间的关系,不直接给出字母的值,该类题一般是把所要求的代数式通过恒等变形,转化成为用已知关系表示的形式。③在给定条件中,字母之间的关系不明显,字母的值隐含在题设条件中,该类题应先由题设条件求出字母的值,再求代数式的值。
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