小亮:我的玻璃球是你的2倍 小丽:要是你给我三颗,我们俩就一样多了 他们两人分别有多少颗玻璃球?(

2024-11-19 09:20:10
推荐回答(5个)
回答1:

小丽有3个,小亮有6个。

解答过程如下:

(1)设小丽的玻璃球数为x,根据小亮:我的玻璃球是你的2倍,可得小亮的玻璃球数为2x。

(2)再根据小丽:要是你给我三颗,我们俩就一样多了。2x-3=x。

(3)2x-3=x这是一个一元一次方程,解得x=3。进而可得小亮有6个。

扩展资料:

整数加减法的运算:

(1)相同数位对齐;

(2)从个位算起;

(3)加法中满几十就向高一位进几;减法中不够减时,就从高一位退1当10和本数位相加后再减。

列方程解应用题的一般步骤:

(1)认真审题,读懂、理解题意。

(2)分析问题中的数量关系及相关量之间的联系,寻求等量关系。

(3)依据题意选择未知数,根据等量关系列方程。

(4)解方程,求出符合实际问题的答案。

回答2:

解:设小丽有x颗,那么小亮有2x颗。
小亮的玻璃球-3颗=小丽的玻璃球+3颗。
2x-3=x+3
2x-3-x=x+3-x
x-3=3
x-3+3=3+3
x=6
小亮的颗数:2X=2×6=12

回答3:

设小丽有x颗,小亮是小丽的2倍就是2x。减3个就相等
2x-3=x+3 小亮给了3颗给小丽所以减3.小丽得了3个就是+3
2x=x+3+3 小亮数量不变的话那么小丽就可以得到6个(原因是把小亮原来要减的加上,小亮数量不变)
2x=x+6 小亮的数量等于小丽+2次的数量
2x-x=6 小亮减去小丽的得到6颗
x = 6 那么小丽的数量就是6颗了
6X2=12 小亮是小丽的2倍所以乘于2=12颗
(找了好多答案都不说明关系的,搞不懂逻辑,自己搜了另外一种理解方法。希望多种方式理解)

回答4:

解:设一个有的玻璃球为X颗,那么另一个就有2X颗。
2X—3=X+3
2X—X=3+3
X=6
2×6=12(颗)
答:一个有玻璃球6颗,另一个有玻璃球12颗。
望采纳!

回答5:

错了,你想想六的确是三的两倍。如果六给三三颗,那么,六则变成了三,三加上六给的三颗,就是六颗,就不一样多了,正确的答案应该是12,6

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