先化简,再求值:m2?2m+1m2?1÷(m?1?m?1m+1),其中m为方程x2-3x=0的解

先化简,再求值:m2?2m+1m2?1÷(m?1?m?1m+1),其中m为方程x2-3x=0的解.
2025-05-14 18:13:21
推荐回答(1个)
回答1:

∵m为方程x2-

3
x=0解,
∴m2-
3
m=0,即m(m-
3
)=0,解得m=0或m=
3

∵原式=
(m?1)2
(m+1)(m?1)
÷
(m+1)(m?1)?(m?1)
m+1

=
(m?1)2
(m+1)(m?1)
÷
m(m?1)
m+1

=
(m?1)2
(m+1)(m?1)
×
m+1
m(m?1)

=
1
m

∵当m=0时分式无意义,
∴m=
3

∴原式=
1
3
=
3
3