最笨就是把四个选项的代进去算算:
A=lg6.5-6.5/9=0.090691134420633351770544040995613
B=lg7.5-7.5/9=0.041727930058366713534216780472796
C=lg8.5-8.5/9=-0.0150255187301517111180134448406
D=lg9.5-9.5/10=-0.077831950266707789232960974523119
所以选C
最笨就是把四个选项的代进去算算:
A=lg6.5-6.5/9=0.090691134420633351770544040995613
B=lg7.5-7.5/9=0.041727930058366713534216780472796
C=lg8.5-8.5/9=-0.0150255187301517111180134448406
D=lg9.5-9.5/10=-0.077831950266707789232960974523119
所以选C