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標題:
1)If a= 5, b= - 4 and c= - 3,
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: 但係佢無講過一定要上門喎!
最佳解答:
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
其他解答:
1) D=b^2- 4ac D=(-4)^2- 4(5)(-3) D=16 - (-60) D=16+60 D=76 2) 24 × 6 + 10=154
1)If a= 5, b= - 4 and c= - 3,
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發問: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: 但係佢無講過一定要上門喎!
最佳解答:
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
其他解答:
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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