小明买了数量相等的面值分别为60分和80分的邮票,一共花了7元钱。两种邮票各多少枚?

2024-12-02 19:35:14
推荐回答(4个)
回答1:

两种邮票各有50张。

根据题意,两种面值的邮票数量相等,所以设两种邮票各有X张,

60分=0.06元,80分=0.08元,

根据题意,可列方程式为:

0.06X+0.08X=7,

解此方程式得,X=50

所以两种邮票各有50张。

扩展资料:

解一元一次方程有五步,即去分母、去括号、移项、合并同类项、系数化为1,所有步骤都根据整式和等式的性质进行。

也可利用求根公式快速解题

对于关于X的一元一次方程

 

其求根公式为:

推导过程

解:移项,得:

系数化为1,得:


参考资料来源:百度百科—一元一次方程

回答2:

设60分、80分都买了X枚,列方程0.6X+0.8X=7 1.4X=7 X=5 答:两种邮票各买了5枚。 其实这题不用设未知数也能求解的,因为两种邮票数量相等,把两种邮票的面值加起来当一种邮票的面值,用总面值除以两种面值的和就求出两种邮票的数量了:7÷(0.6+0.8)=5(枚)。

回答3:

各5枚,共计10枚

回答4:

9+2

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