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f2 maths 2
2007-10-23 6:13 am
回答 (3)
2007-10-23 6:19 am
✔ 最佳答案
y/(x+2) = 8y = 8(x+2)
y = 8x+16
y﹣16 = 8x
(y﹣16)/8 = x
x = (y﹣16)/8
3/(4x+2y) = 1
3 = 4x+2y
3﹣2y = 4x
x = (3﹣2y)/4
a = 2(c﹣b)/b
ab = 2c﹣2b
ab+2b = 2c
b(a+2) = 2c
b = 2c/(a+2)
2007-10-28 5:05 am
1. y/x+2=8 [x]
y=8(x+2)
y/8=x+2
y/8-2=x
2. 3/4x+2y=1 [x]
3=4x+2y
3-2y=4x
3-2y/4=x
3. a=2(c-b)/b [b]
ab=2(c-b)
ab=2c-2b
ab+2b=2c
b(a+2)=2c <-因式分解
b=2c/a+2
y=8(x+2)
y/8=x+2
y/8-2=x
2. 3/4x+2y=1 [x]
3=4x+2y
3-2y=4x
3-2y/4=x
3. a=2(c-b)/b [b]
ab=2(c-b)
ab=2c-2b
ab+2b=2c
b(a+2)=2c <-因式分解
b=2c/a+2
參考: 自己
2007-10-23 6:20 am
y/(x+2) = 8
=> y = 8(x+2)
=> x = y/8 -2
=> x = (y - 16)/8
3/(4x+2y) = 1
3 = 4x +2y
4x = 3 - 2y
x = (3-2y)/4
a = 2(c-b)/b
ab = 2c - 2b
ab+2b = 2c
b (a+2) = 2c
b = 2c / (a+2)
=> y = 8(x+2)
=> x = y/8 -2
=> x = (y - 16)/8
3/(4x+2y) = 1
3 = 4x +2y
4x = 3 - 2y
x = (3-2y)/4
a = 2(c-b)/b
ab = 2c - 2b
ab+2b = 2c
b (a+2) = 2c
b = 2c / (a+2)
參考: My calculation
收錄日期: 2021-04-25 00:05:09
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071022000051KK04204