在五一期间,小明、小亮等同学随家长一同到某公园游玩,下面是购买门票时,小明与他爸爸的对话,

2024-11-23 04:41:34
推荐回答(4个)
回答1:

(1)设成人X个,学生(12-X)个
40X+20(12-X)=400
X=8
12-8=4个
答:成人8个,学生4个。
(2)当成人和学生人数<16时,第一种省钱
当成人和学生人数≥16时,团体票省钱

回答2:

假设去了成人x个,学生y个,则由题可以得出:
x+y=12
35x+35/2*y=350
解一个二元一次方程组,就可以得出:x=8,y=4
即8个成人,4个学生。
(2)没看懂题目意思。
附加题:
同样假设大人x个 ,学生y个,
则: y>x
35x+35/2*y=105
由第二个方程式化简可得:x+y/2=3
即:y=6-2x,并将其带入y>x,则可以知道:
6-2x>x
3x<6
x<2
又因为人比为整数,所以x=0或者x=1
当x=0时,y=6
当x=1时,y=4
所以可能出现两种情况:第一种,只有6个学生;
第二种,1个大人,4个学生。

回答3:

大人为X小孩为Y X+Y=12 40X+20Y=400 链式运算 X=8 Y =4 。。直接买团体票 16X24=384 多了4张票 还便宜16元

回答4:

8成人,4学生 第二种(384元)更省钱

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