標題:
有d數學問題想問下
發問:
最佳解答:
a + 3b = 18 ------1 3a + 5b = 34 -----2 1. a = 18-3b 2. 3( 18-3b) + 5b = 34 54 - 6b + 5b = 34 54 -b = 34 b = 20 1. a = 18 - 3 ( 20 ) a = 42 2007-07-12 13:24:17 補充： a + 3b = 18 ------1{3a + 5b = 34 -----2在1 , a = 18-3b在2 , 3 ( 18-3b) + 5b = 34 54 - 9b + 5b = 34 54 -4b = 34 b = 5代返b = 5 去1 , a = 18 -3b a = 18-3(5) a= 3岩岩打錯左少少．．．．要改返今次呢個先岩
其他解答:
對唔住.我唔知|||||a+3b=18--------1 { 3a+5b=34---------2 From 1, a=18 - 3b----------3 Sub. 3 into 2 3(18 - 3b) +5b = 34 54 - 9b + 5b = 34 - 4b = - 20 b=5 Sub b=5 into 1 a+3(5)=18 a=3 2007-07-12 13:23:22 補充： 樓上計錯數
有d數學問題想問下
發問:
此文章來自奇摩知識+如有不便請留言告知
solve the following systems of equations by the method of sudstitution. a+3b =18 { 3a+5b =34 我晤識呀~ 解釋一下唔該 快! 唔該....最佳解答:
a + 3b = 18 ------1 3a + 5b = 34 -----2 1. a = 18-3b 2. 3( 18-3b) + 5b = 34 54 - 6b + 5b = 34 54 -b = 34 b = 20 1. a = 18 - 3 ( 20 ) a = 42 2007-07-12 13:24:17 補充： a + 3b = 18 ------1{3a + 5b = 34 -----2在1 , a = 18-3b在2 , 3 ( 18-3b) + 5b = 34 54 - 9b + 5b = 34 54 -4b = 34 b = 5代返b = 5 去1 , a = 18 -3b a = 18-3(5) a= 3岩岩打錯左少少．．．．要改返今次呢個先岩
其他解答:
對唔住.我唔知|||||a+3b=18--------1 { 3a+5b=34---------2 From 1, a=18 - 3b----------3 Sub. 3 into 2 3(18 - 3b) +5b = 34 54 - 9b + 5b = 34 - 4b = - 20 b=5 Sub b=5 into 1 a+3(5)=18 a=3 2007-07-12 13:23:22 補充： 樓上計錯數
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