F.1 數學 ALGEBRAIC

2008-03-26 9:21 pm
2x+1 /3 - x-2 /2 =2
ps. 「/」 = over

x=?

要step,thz!

回答 (2)

2008-03-26 9:24 pm
✔ 最佳答案
(2x+1)/3 - (x-2)/2 = 2
(4x+2)/6 -(3x-6)/6 = 2
     (4x+2-3x+6)/6 = 2
           (x+8)/6 = 2
               x+8 = 12
                 x = 4
2008-03-26 9:33 pm
2x+1 /3 - x-2 /2 =2
(2x+1 /3 - x-2 /2)6 =2*6 (對方擴分,搵最小L.C.M)
[(2x+1) /3]*6 - [(x-2) /2]*6 =12
4x+2-3x+6=12
x+8=12
x=4


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