2a+b=3b-a
3a-2b+c=4b-5a
a=?
b=?
I lit the step:
2a+b=3b-a
=>3a+b=3b
=>3a=2b
3a-2b+c=4b-5a
=>3a=6b-5a
=>8a+c=6b
Can you expain Why
3a : 2b
8a+c : 6b
What is c
How many c = 1a
And how many c = 1b ?
數 - 代數 (12) - 2a+b=3b-a
2009-09-27 12:32 am
回答 (1)
2009-09-27 3:27 am
✔ 最佳答案
2a + b = 3b - a ... (1)3a - 2b + c = 4b - 5a ... (2)
(1) => 3a = 2b
b = 3a/2 ... (3)
(2) => 8a - 6b + c = 0
Use (3), 8a - 6(3a/2) + c = 0
8a - 9a + c = 0
a = c
Sub into (3), b = 3c/2
收錄日期: 2021-04-23 23:20:09
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