挑战习题
1/5单选题
难度:

1.已知关于x的一元二次方程x2-(m-3)x+m-4=0,若方程有一个根大于4且小于8,求m的取值范围(    )
A 8<m<12
B m>12
C m<8
D m>8
提示1:
IOihqOekuuWHuuaWueeoi+eahOino++8jOagueaNruaWueeoi+acieS4gOS4quagueWkp+S6jjTkuJTlsI/kuo445YiX5Ye65LiN562J5byP77yM5rGC5Ye65LiN562J5byP55qE6Kej6ZuG5Y2z5Y+v56Gu5a6a5Ye6beeahOiMg+WbtC4=
正确答案:QQ==
6Kej77ya5pa556iL5Y+Y5b2i5b6X77ya77yIeC0x77yJ77yIeC1tKzTvvIk9MO+8jDxicj7op6PlvpfvvJp4PHN1Yj4xPC9zdWI+PTHvvIx4PHN1Yj4yPC9zdWI+PW0tNO+8jDxicj7moLnmja7popjmhI/lvpfvvJo077ycbS0077ycOO+8jDxicj7op6PlvpfvvJo477ycbe+8nDEyLiA=