a |
b |
c |
d |
(2)∵f(1-x)=f(1+x)∴f(x)图象关于x=1对称
当二次项系数m>0时,f(x)在(1,+∞)内单调递增,
由f(
a |
b |
c |
d |
a |
b |
c |
d |
又∵x∈[0,π]∴x∈(
π |
4 |
3π |
4 |
当二次项系数m<0时,f(x)在(1,+∞)内单调递减,
由f(
a |
b |
c |
d |
a |
b |
c |
d |
又∵x∈[0,π]∴x∈[0,
π |
4 |
3π |
4 |
故当m>0时不等式的解集为(
π |
4 |
3π |
4 |
π |
4 |
3π |
4 |
a |
b |
1 |
2 |
c |
d |
a |
b |
c |
d |
a |
b |
c |
d |
a |
b |
c |
d |
a |
b |
c |
d |
a |
b |
c |
d |
π |
4 |
3π |
4 |
a |
b |
c |
d |
a |
b |
c |
d |
π |
4 |
3π |
4 |
π |
4 |
3π |
4 |
π |
4 |
3π |
4 |