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58问答库 > 铅笔和钢笔共有48盒共605只铅笔每盒十五支钢笔每盒十支铅笔钢笔各有几只。

铅笔和钢笔共有48盒共605只铅笔每盒十五支钢笔每盒十支铅笔钢笔各有几只。

2025-03-29 05:05:29

推荐回答（4个）

回答（1）：

铅笔有：
（605-48X10）÷(15-10)
=125÷5
=25盒
铅笔支数为：25X15=375支
钢笔支数有：605-375=230支

回答（2）：

设铅笔有x盒，则钢笔有48-x盒
15x+10（48-x）=605
15x+480-10x=605
5x=125
x=25
铅笔:15x25=375支
钢笔:605-375=230支

回答（3）：

x+y=48
15ⅹ十1Og=6O5
解得:ⅹ=25盒
y=23盒
答:铅笔25盒，钢笔23盆。

回答（4）：

利用二元一次方程求解:
设铅笔有x盒，钢笔有y盒
x+y=48
10x+15y=605
联立两个方程解方程组

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