hzb53jl55v的部落格

標題:

F.1 maths,help me pls!

發問:

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?

最佳解答:

1.設大的數為A,細既數為B A+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

• 急!衛生巾1問...White同護舒寶係唔係同1個牌子-
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• 急!衛生巾1問...White同護舒寶係唔係同1個牌子-
• 60-60-60 Prism refraction
• directrix of hyperbola

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其他解答:

1. 54, 66 2. 163 4. 蘋果=11 芒果=18 5. 10|||||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