數學方程式求解,以y表示x?

2020-08-17 5:29 pm
(4x-1)/(2x+3)=y
請以y表示x

回答 (1)

2020-08-17 7:08 pm
✔ 最佳答案
y = (4x-1)/(2x+3)
<==> 4x-1 = y(2x+3) = 2yx +3y
<==> 4x-2yx = 3y+1
<==> x = (1+3y)/(4-2y)  (if  y ≠ 1/2 and x ≠ -3/2)

y = 1/2 
   <==> 2(4x-1) = 2x+3 
   <==> 8x-2 = 2x+3 
   <==> 6x = 5
   <==> x = 5/6

If x ≠ -3/2 and x ≠ 5/6 then
   y = (4x-1)/(2x+3) <==> x = (1+3y)/(4-2y);
if x = 5/6 then y = 1/2

Or,
   x = (1+3y)/(4-2y)   if y ≠ 1/2,
      = 5/6                  if y = 1/2


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