✔ 最佳答案
1. 解以下聯合二元一次方程.
x/2 + y/3 = 1
(5x+3y)/4 = 3
Sol:
x/2 + y/3 = 1
9x + 6y = 18 ....... ( 1 ) ( multiply 18 both sides )
(5x+3y)/4 = 3
10x + 6y = 24 ....... ( 2 ) ( multiply 8 both sides )
( 2 ) - ( 1 )
x = 6
9 * 6 + 6y = 18
6y = - 36
y = - 6
Ans: x = 6, y = - 6
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