帮我看看这几个题怎么解,今晚作业,在线等,急急急急急急急急急急急急

2024-11-24 23:09:52
推荐回答(4个)
回答1:

1.解:设挖土人数为X,运土人数为Y
则有:X+Y=240和3X=5Y
所以X=5Y/3
将x=5y/3代入X+Y=240
那么5Y/3+Y=240
5Y/3+3Y/3=240
8Y/3=240
Y=90
则X=5Y/3=5*90/3=150

2.解:设盒身x,盒底盖y,则 x+y=20
所以有方程: 2*2x=3y
x=60/7
y=80/7
答:盒身8张,盒盖11张,最后一张做一个盒身一个盒盖,刚好组成17个盒子

3. 解:设做3套设备共需要X个零件,则甲需要X/2个,乙需要X/3个,丙需要X/6个
所以可得:.X/2除以120+X/3除以100+X/6除以200=130
解得X=15600
X/2=7800 X/3=5200 X/6=2600
答:得甲需要7800除以120=65,乙需要5200除以100=52丙需要,2600除以200=13
望楼主采纳!!不胜感激!!

回答2:

1. 这是一个比例问题。要使挖的土能全部运走并没人闲,首先挖土的:运土的=5:3
挖土的人就应是:48*3/8=18人,运土的人:48*5/8=30人。18人挖的土刚好30人全运 走,并没得人耍。。。
设X人挖土,则运土人为48-X。
5X=(48-X)*3
X=18
2.怎么有白卡纸又有白铁皮,我理解为一种东西。
设x张做盒身。那么100-X张做盒底。 通过一个盒身与两个盒底为一套列方程
16X=(100-X)*43*2
3.设生产甲种零件为X天,则乙种为30-X。
120X除以3=100*(30-X)/2

自己解

回答3:

no1 设挖土人数为X,运土人数为Y,则有X+Y=240和3X=5Y,推出X=5Y/3,代入X+Y=240,则5Y/3+Y=240 ---->5Y/3+3Y/3=240 ---->8Y/3=240 ---->Y=90,则X=5Y/3=5*90/3=150

no2 盒身x,盒底盖y,则 x+y=20
2*2x=3y
x=60/7
y=80/7
所以盒身8张,盒盖11张,最后一张做一个盒身一个盒盖,刚好组成17个盒子

no3 解:设做3套设备共需要X个零件,则甲需要X/2个,乙需要X/3个,丙需要X/6个
.X/2除以120+X/3除以100+X/6除以200=130
得X=15600
X/2=7800 X/3=5200 X/6=2600
所以得甲需要7800除以120=65,乙需要5200除以100=52丙需要,2600除以200=13

回答4:

我不知道。请把我加成好友吧

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