1)There is a portrait in an art museum.its length is 24cm longer than its width.it is known that the perimeter of the portrait is 208cm.Finds its area.
2)Martin bought two pieces of cheese and used two-thirds of them to make cheese cake.Five-eighths of the remaining cheese is 200g in weight.Find the weight of one piece of cheese.
F.1數學(方程式)要例式
2007-07-18 10:58 pm
回答 (2)
2007-07-18 11:55 pm
✔ 最佳答案
1) LET X BE THE WIDTH OF THE PORTRAIT,X + 24 BE THE LENGTH OF THE PORTRAIT
2*[X+(X+24)] = 208
2*[2X+24] = 208
4X + 48 = 208
4X = 208 - 48
4X = 160
X = 40
THUS, THE WIDTH OF THE PORTRAIT IS 40CM, THE LENGTH OF THE PORTRAIT IS 40+24CM = 64CM
THE AREA OF THE PROTRAIT = 40 * 64
= 2560 CM^2
2007-07-18 16:51:19 補充：
2) LET X BE THE WEIGHT OF TWO PIECE OF CHESSE CAKESTHEN, 1/3X * 5/8 = 200 1/3X = 200 * 8/5 1/3X = 1600/5 1/3X = 320 X = 320 * 3 X = 960THE WEIGHT FOR ONE PIECE OF CHESSE CAKE = 960 / 2 = 480g
2007-07-18 11:08 pm
1.24y÷2=208
24y÷2x2=208x2
24y=416
y= 17又8分1
2.y(two-thirds +Five-eighths)=200
24y÷2x2=208x2
24y=416
y= 17又8分1
2.y(two-thirds +Five-eighths)=200
收錄日期: 2021-04-14 00:33:14
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