Question

Cindy

求解

相同的解
進階演練
3x-a
若x的一元一次方程式
=-1與
2
5x-4=30 有
=3a有相同解,則a值與相同解 x
3
OS
分別為多少?
()
解
32-9
2
二十

請問這題怎麼解

Answer 1

綾

(3x - a)/2 = -1
=> 3x - a = -2
=> 3x = a - 2
=> x = (a - 2)/3

(5x - 4)/3 = 3a
=> 5x - 4 = 9a
=> 5x = 9a + 4
=> x = (9a + 4)/5

(a - 2)/3 = (9a + 4)/5
5(a - 2) = 3(9a + 4)
5a - 10 = 27a + 12
22a = -22
a = -1
x = (a - 2)/3 = -1

Cindy

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