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| 2017/06/29 06:58:21瀏覽39｜回應0｜推薦0 | |
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此文章來自奇摩知識+如有不便請留言告知 我想問呢題數呀!!!thx*發問: The value of a is 4 times that of b. If their sum is 45, find the value of a. 我想問點樣列條式呀!!! thx哂* 更新: 同埋呢句野係點解? 最佳解答: This is a equation in 2 unknowns 4a=b .....1) a+b=45 .....2) From 2), a+b=45 a=45-b ....3) Sub 3) to 1), 4*(45-b)=b 180-4b=b 180=5b b=36 so, b=36, 4a=36 ,a=9. 2007-04-12 10:15:10 補充： SORRY- - 我mix up 左 a , b4b=a .....1)b+a=45 .....2)From 2),b+a=45b=45-a ....3)Sub 3) to 1),4*(45-a)=a180-4a=a180=5aa=36so, a=36 其他解答: The value of a is 4 times that of b. If their sum is 45, find the value of a a 的值是 b 的值的 4 倍 ， a 及 b 的和是 45 ，找出 a 的值。 a = 4b ----- "1" a + b = 45 ---- "2" substitute "1" into "2" 4b + b = 45 5b = 45 b = 9 substitute b = 9 into "1" a = 4 x 9 a = 36|||||a+1/4a =45 a =45 x 4/5 a = 36 應該係咁 2007-04-12 10:20:19 補充： 數值a是b的4倍，如果他們的和是45，找出a的數值 |
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