1}小民买5本练习本和3本笔记本共付4元9角,若买3本练习本比2本笔记本便宜1角,那么练习本和笔记本的单价各是多少?
2}小民和小里分别从相距1.2千米的两地相向而行,若同时出发,经过24分钟后两人相遇;若小里提前10分钟出发,在小民出发20分钟后与小里相遇,
3}
人气:271 ℃ 时间:2020-06-14 14:01:43
解答
1}设练习本和笔记本的单价分别是X和Y
5X+3Y=4.9
3X+0.1=2Y
x=0.5,y=0.8
2}设小民的速度为X小里的速度为Y
(X+Y)*24=1.2
20x+(10+20)*y=1.2
y=0.02千米/分钟=20米/分
X=0.03千米/分钟=30米/分
推荐
猜你喜欢
- 118.Greater efforts to control the population must be made if food shortage __________ avoided.
- yes! i can do it! don't give up because he is by my side! 求翻译!
- I know what it is like to work hard on a story only to receive a rejection slip form the publisher what 充当的是know后的宾语还是li
- The house___doors and windows are all closed is for sale.A.which B.whose C.in which D.in tha
- going,are,have,lunch,we,to,together.连词成句
- 甲烷与氢气的混合气体,其密度是氢气的5倍(相同条件下),则混合气体中甲烷与氢气的体积比为多少?
- 大山的妈妈从市场买了14个水果,其中桃是苹果的2倍,梨比苹果少2个.问3种水果各多少个
- 英语翻译