1.兩數之和為120,而差為12。求該兩個數。
2.把一些紙卡分給20位男孩。若每位男孩分得8張紙卡，而有3張紙卡剩下，求紙卡的原來數量。
3.把$430分給A,B及C三人,使得A比C分得多$30,而B分得的為C的3倍。問每人分得多少元?
4.李太太買了一些蘋果及芒果。若芒果比蘋果多7個，而水果的總數為29，那麼李太太分別買了多少個蘋果及芒果?
5.陳先生比陳太太年長5年。陳太太的年齡為他的兒子的3倍。若他們三人的年齡總和為75歲，那麽他們的兒子現時多少歲?
F.1 maths,help me pls!
2013-11-03 6:35 pm
回答 (3)
2013-11-03 7:04 pm
✔ 最佳答案
1.設大的數為A,細既數為BA+B=120------(1)
A-B=12-----(2)
從(2),
A=12+B----(3)
把(3)代入(1)
12+B+B=120
2B+12=120
2B=108
B=54
把B=54代入(1)
A+54=120
A=66
建議你入條公式係計算機到,咁會好D
2013-11-03 7:06 pm
I'm now providing the equations for you, please calculate 'em by yourself. :)
1. Let the larger number be y,
(y-12)+y = 120
(After you have found y, find the smaller number by doin' take away.
2. 8+3/8=8.375
Let the original amount of cardboard be y
y/20=8.375
3. Let C receives y dollar,
(y+30)+3y+y = 430
Please also find the amount of A,B receive
4. Let Ms. Lee has bought y apples
y+ (y+7) =29
Please also find the number of mangos by addition
5. Let y be the Ms.Chan's age
(y+5)+y+(y/3) = 75
And you'll find the son's age by dividing y by 3.
2013-11-03 11:07:56 補充：
*. 5. Let y be Ms.Chan's age
1. Let the larger number be y,
(y-12)+y = 120
(After you have found y, find the smaller number by doin' take away.
2. 8+3/8=8.375
Let the original amount of cardboard be y
y/20=8.375
3. Let C receives y dollar,
(y+30)+3y+y = 430
Please also find the amount of A,B receive
4. Let Ms. Lee has bought y apples
y+ (y+7) =29
Please also find the number of mangos by addition
5. Let y be the Ms.Chan's age
(y+5)+y+(y/3) = 75
And you'll find the son's age by dividing y by 3.
2013-11-03 11:07:56 補充：
*. 5. Let y be Ms.Chan's age
參考: Me
收錄日期: 2021-04-23 23:44:28
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