1. Solve -2(4x+1)<_13-3x
2. Given 5a+b=2a+3b (代入法)
(a) Find a:b
Maths Questions
2011-12-12 6:43 am
回答 (2)
2011-12-12 6:46 am
✔ 最佳答案
1.-2(4x+1)</=13-3x-8x-2</=13-3x
-15</=5x
-3</=x
x>/=-3
2(a)5a+b=2a+3b
3a=2b
a/b=2/3
a:b=2:3
參考: me
2011-12-12 7:31 pm
3)
3x = y + 2 ... (1)
x - 2y = -1
x - 2y = -1
x = 2y - 1 ... (2)
代 (2) 入 (1):
3(2y - 1) = y + 2
6y - 3 = y + 2
6y - y = 3 + 2
y = 1 ... (3)
代 (3) 入 (2):
x = 2(1) - 2
x = 1
∴ x = 1, y = 1
3x = y + 2 ... (1)
x - 2y = -1
x - 2y = -1
x = 2y - 1 ... (2)
代 (2) 入 (1):
3(2y - 1) = y + 2
6y - 3 = y + 2
6y - y = 3 + 2
y = 1 ... (3)
代 (3) 入 (2):
x = 2(1) - 2
x = 1
∴ x = 1, y = 1
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