1.In the equation AB+AC=BB,each letter represents an integer from 0 to 4.Different letters represent different integers.Suggest one value for each letter which satisfies the equation.
2.The base and rhe height of a triangular metal plate are8 com and4 cm respectively.The metal plate is melted and recast into s metal plate in the shape of trapezium with a height the same as that of the triangle .Find two possible pqirs of the lenghts of the shorter base and the longer base of the new metal plate.(Hint:The thickness of metal plates can be ignores.)
3.A hawer spent ＄180 to buy 600 toy balls.The hawker is going to sell the balls .Suggest the selling price for each thoy ball such that he can get a profit percentage of at least 40 ℅ after all the balls are sold.
我有D F.1 的數學題吾識做,有冇人可以教下我?
2008-08-24 11:07 pm
回答 (2)
2008-08-25 12:32 am
✔ 最佳答案
1.B+C=B
Hence, C = 0
A + A = B
Hence, B = 2A
A possible set of answers: A = 1, B = 2, C = 0
(12 + 10 = 22)
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2.
Area of the triangle = (8 cm) x (4 cm) / 2 = 16 cm2
Area of the trapezium = Area of the triangle
(Shorter base + Longer base) x (4 cm) / 2 = 16 cm2
(Shorter base + Longer base) x (2 cm) = 16 cm2
Shorter base + Longer base = 8 cm
First possible pair: shorter base = 3 cm, and longer base = 5 cm
Second possible pair: shorter base = 2 cm, and longer base = 6 cm
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3.
Cost of each ball = $180 / 600
Cost of each ball = $0.3
Selling price of each ball ≥ $0.3 x (100 + 40)%
Selling price of each ball = $0.42
Ans: The cost price should be at least $0.42.
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收錄日期: 2021-04-23 23:05:16
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