Question

已知3a^-1+2=0(a不等于0）,把（a-2分之1)-(a分之1）除以2分之a-2化简后求值

Answer 1

3a^-1+2=0

3/a=-2

a=-3/2

∴（a-2分之1)-(a分之1）除以2分之a-2

=(a-1/2)-1/a÷(a-2)/2

=(-3/2-1/2)-2/(-3/2)(-3/2-2)

=-2-2/(3/7)

=-2-7/6

=-19/6

1/(a-2)-1/a*2/(a-2)

=1/(a-2)-2/a(a-2)

=(a-2)/a(a-2)

=1/a

=1/(-3/2)

=-2/3

题目有两种可能,我都解了