新型的玩具
① 某玩具廠趕制一批新型玩具,第一天製作了54個,占總數的1/7。這批新型玩具一共有多少個
這批新來型玩具一共有自378個。
假設批玩具的總數為X個,根據題干可以得出以下方程:
X*1/7=54
X=54 ÷1/7
=378
所以這批新型玩具一共有378個。
(1)新型的玩具擴展閱讀
列方程解應用題的方法
1、綜合法:先把應用題中已知數(量)和所設未知數(量)列成有關的代數式,再找出它們之間的等量關系,進而列出方程。
這是從部分到整體的一種 思維過程,其思考方向是從已知到未知。
2、分析法:先找出等量關系,再根據具體建立等量關系的需要,把應用題中已知數(量)和所設的未知數(量)列成有關的代數式進而列出方程。
這是從整體到部分的一種思維過程,其思考方向是從未知到已知。
② 新型電動玩具的英語作文
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,某玩具經銷商用去2350元購進A、B、C三種新型的電動玩具共50套,並且購進的三種玩具都不少
(1)已知共購進A、B、C三種新型的電動玩具共50套,故購進C種玩具套數為:50-x-y;
(2)由題意得40x+55y+50(50-x-y)=2350,整理得y=2x-30;
(3)①利潤=銷售收入-進價-其它費用,
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購進C種電動玩具的套數為:50-x-y=50-x-(2x-30)=80-3x,
據題意列不等式組
熱點內容
|