新型的玩具
① 某玩具厂赶制一批新型玩具,第一天制作了54个,占总数的1/7。这批新型玩具一共有多少个
这批新来型玩具一共有自378个。
假设批玩具的总数为X个,根据题干可以得出以下方程:
X*1/7=54
X=54 ÷1/7
=378
所以这批新型玩具一共有378个。
(1)新型的玩具扩展阅读
列方程解应用题的方法
1、综合法:先把应用题中已知数(量)和所设未知数(量)列成有关的代数式,再找出它们之间的等量关系,进而列出方程。
这是从部分到整体的一种 思维过程,其思考方向是从已知到未知。
2、分析法:先找出等量关系,再根据具体建立等量关系的需要,把应用题中已知数(量)和所设的未知数(量)列成有关的代数式进而列出方程。
这是从整体到部分的一种思维过程,其思考方向是从未知到已知。
② 新型电动玩具的英语作文
When I was a small child, my family lived in the village。 It was just after the war, and many usually made our own toys, or we played with the animals or insects around our house。 We looked for crickets or snakes ring the summer afternoon。 At might we went out to the fields to catch fireflies。 Sometimes we just played with sand, rocks, tree branches, or small birds。 In contrast, a visit to a big toy store in the city today is very exciting。 There are so many different toys to see, hear, and touch that I always feel like being a small child again
③ “六一”前夕,某玩具经销商用去2350元购进A、B、C三种新型的电动玩具共50套,并且购进的三种玩具都不少
(1)已知共购进A、B、C三种新型的电动玩具共50套,故购进C种玩具套数为:50-x-y;
(2)由题意得40x+55y+50(50-x-y)=2350,整理得y=2x-30;
(3)①利润=销售收入-进价-其它费用,
故:p=(50-40)x+(80-55)y+(65-50)(50-x-y)-200,
又∵y=2x-30,
∴整理得p=15x+250,
②购进C种电动玩具的套数为:50-x-y=50-x-(2x-30)=80-3x,
据题意列不等式组
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