函数 二次方程1.The diagram shows the outdoor pool at Lakeview Park.A cement deck 2 m wide surrounds the outside edge of the pool.Calculate the area of the deck.2.Determine the maximum area of a triangle,in square centimetres,if the sum of its b

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/08 04:45:43

函数 二次方程1.The diagram shows the outdoor pool at Lakeview Park.A cement deck 2 m wide surrounds the outside edge of the pool.Calculate the area of the deck.2.Determine the maximum area of a triangle,in square centimetres,if the sum of its b
函数 二次方程
1.The diagram shows the outdoor pool at Lakeview Park.A cement deck 2 m wide surrounds the outside edge of the pool.Calculate the area of the deck.
2.Determine the maximum area of a triangle,in square centimetres,if the sum of its base and its height is 10 cm.
3.A photograph measuring 12cm by 8cm is to be surrounded by a mat before framing.The width of the mat is to be the same on all sides of the photograph.The area of the mta is to equal the area of the photograph.Find the width of the mat.

函数 二次方程1.The diagram shows the outdoor pool at Lakeview Park.A cement deck 2 m wide surrounds the outside edge of the pool.Calculate the area of the deck.2.Determine the maximum area of a triangle,in square centimetres,if the sum of its b
1.The diagram shows the outdoor pool at Lakeview Park.A cement deck 2 m wide surrounds the outside edge of the pool.Calculate the area of the deck.
Solution :
Pool area = 25×30 + 10×15 = 900 (m²)
Deck area = (25+4)×(30+10+4) - 5×10×2 - 900 = 276 (m²)
2.Determine the maximum area of a triangle,in square centimetres,if the sum of its base and its height is 10 cm.
Solution:
Let the base be x,so the height is (10 - x)
Area of triangle = ½x(10-x) = -½(x²-10x) = -½(x²-10x+25-25)
= 12.5 - ½(x-5)²
So,if x = 5,maximum area of triangle = 12.5 (cm²)
3.A photograph measuring 12cm by 8cm is to be surrounded by a mat before framing.The width of the mat is to be the same on all sides of the photograph.The area of the mat is to equal the area of the photograph.Find the width of the mat.
Solution:
Let x be the width of the mat.
Area of photograph = 12×8 = 96 (cm²)
Area of photograph with mat = (12+2x)×(8+2x) = 192
(12+2x)×(8+2x) = 192
(6+x)×(4+x) = 48
x²+10x-24=0
(x+12)(x-2)=0
x₁= 2 (cm); x₂= -12 (cm)(unresonable,rejected)
Ans:Width of the mat is 2 cm.

2. S=x(10-x)=<(10/2)^2=25
3. S=25*30+15*10=900
边长为根号900=30cm

比竞赛还难…1.一条边(棱)为2m，求面积应该是4m^2…2.三角形底边s与高h之和为10，求最大面积。由((s+h)/2)^2>=s*h知S=(1/2)*s*h=12.5(cm^2)…3.长12，宽8，最长的应该是4*((根号)13)cm

函数 二次方程1.The diagram shows the outdoor pool at Lakeview Park.A cement deck 2 m wide surrounds the outside edge of the pool.Calculate the area of the deck.2.Determine the maximum area of a triangle,in square centimetres,if the sum of its b 英语翻译请翻译 As shown in the follow diagram,there is a 5 multiply 5 checkered table,and the side length of each small check is 1.Now please calculate the total area of the shaded part in the diagram. 英语翻译The cam layout depends on the displacement diagram and on the three main geometric factors, 英语翻译The resistors in the above circuit diagram are connectied in______. 将这个句子改成被动语态The diagram gives all the results one by one. The diagram must contain a powergui block.The block must be named and should be located 求教SIMULINK仿真错误：The diagram must contain a powergui block.The block must be named Build the orbital diagram for the ion most likely formed by phosphorus 英语翻译Figure 1.Diagram of the technique for crowd density estimationby using Minkowski sausages.Step 1:detects the edges of theinput image; calculates the sausages from the binary edgedetected image using structuring elements of different sizes 翻译a diagram of the stages of a process or procedure A“family tree”is a diagram of the people in a In system modeling,describe the meaning of System Flow Diagram (SFD) and a level的数学1.The first diagram shows two circles each of radius 6 centimetres,one centred at A and the other at B.这句话翻译一下 求改错：these is the result that 接下dynamic change was vividly explained by the diagram of the text between 与among用between与among填空1.we asked 30 stuedents ____ twelve and sixteen.2.the diagram shows computer use is quite high ____ 14-18 years old.why In the following diagram,the vertex of the right angle is on line L.In the following diagram,the vertex of the right angle is on line L.Please calculate the sum of all the angles' degrees in the diagram that is smaller than a straight angle.翻译翻 英语翻译The Flow Diagram is keyed or numbered and illustrates the sequence of production and inspection from receiving through shipping. To the right is a diagram of a 4 kg weight hanging from a massless string.The weight is connected