2)A merchant sells chairs at $24 each and charges $10 for sending them to the customer's house, whatever the quantity. A man buys 6 chairs, how much should he pay totally ?
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1)If a= 5, b= - 4 and c= - 3,
2009-01-29 6:50 am
1)If a= 5, b= - 4 and c= - 3, find the value of D= b(2次)- 4ac.
2)A merchant sells chairs at $24 each and charges $10 for sending them to the customer's house, whatever the quantity. A man buys 6 chairs, how much should he pay totally ?
2)A merchant sells chairs at $24 each and charges $10 for sending them to the customer's house, whatever the quantity. A man buys 6 chairs, how much should he pay totally ?
回答 (2)
2009-01-29 6:57 am
✔ 最佳答案
1. a=5 , b=-4 and c=-3D = b^2-4ac = (-4)^2-4(5)(-3) = 16+60 = 76
將a,b and c代入條式度就得
2. he should pay totally = 6*$24+$10 = $144+$10 = $154
不管買多少張,都係收$10運費
2009-01-31 23:16:54 補充：
2. 如果唔係送貨.... 6*$24=$144
2009-01-29 6:58 am
1)
D=b^2- 4ac
D=(-4)^2- 4(5)(-3)
D=16 - (-60)
D=16+60
D=76
2)
24 × 6 + 10=154
D=b^2- 4ac
D=(-4)^2- 4(5)(-3)
D=16 - (-60)
D=16+60
D=76
2)
24 × 6 + 10=154
收錄日期: 2021-04-23 23:22:21
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