標題:
F.3 Maths 要步驟 急 !! ><
發問:
< Linear Inequalities in One Unknown > F.3 Maths 要步驟 急 !! >< 更新: 1. If the sum of three consecutive odd number is less than 49, what is the largest possible value of the smallest number ? 2. Ben has 20 coins which consist only of $2-coins and $5-coins. If the total amount of these coins is not less than $85, how many $2-coins can he have at most ?
最佳解答:
1. let x be the smallest one, then x+2 and x+4 be the other two x + (x+2) + (x+4) < 49 3x + 6 < 49 3x < 43 x < 43/3 x < 14.33 the largest possible value of x is 13 2. let x be $2 while 20-x be $5 2x + 5(20-x) >= 85 2x + 100 - 5x >= 85 100 - 3x >= 85 100 - 85 >= 3x 15 >= 3x 5 >= x thus, the most number of $2 is 5
F.3 Maths 要步驟 急 !! ><
發問:
< Linear Inequalities in One Unknown > F.3 Maths 要步驟 急 !! >< 更新: 1. If the sum of three consecutive odd number is less than 49, what is the largest possible value of the smallest number ? 2. Ben has 20 coins which consist only of $2-coins and $5-coins. If the total amount of these coins is not less than $85, how many $2-coins can he have at most ?
最佳解答:
1. let x be the smallest one, then x+2 and x+4 be the other two x + (x+2) + (x+4) < 49 3x + 6 < 49 3x < 43 x < 43/3 x < 14.33 the largest possible value of x is 13 2. let x be $2 while 20-x be $5 2x + 5(20-x) >= 85 2x + 100 - 5x >= 85 100 - 3x >= 85 100 - 85 >= 3x 15 >= 3x 5 >= x thus, the most number of $2 is 5
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