1)If a= 5, b= - 4 and c= - 3,

👨🏻‍🏫 學術台數學

kawing1001

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 ?

更新1:

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回答 (2)

用戶22403

2009-01-29 6:57 am

✔ 最佳答案

1. a=5 , b=-4 and c=-3
D = 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

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[匿名]

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

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