Question

1,小华在解方程5/2a-x=1/4【x是未知数】时,误将-x看成+x,得方程解为x=1,则原方程

Answer 1

5/2a-x=1/4

5/2a+1=1/4

所以a = -3/10

-3/4 - x = 1/4

x = -1

2x-1 = x+a -1 x=2

所以 2*2-1=2+a-1 a=2

所以原方程为

[2x-1】/3=【x+2】/3-1

2x -1 = x + 2 - 3

x = 0