A:30个
B:90个
C:60个
——Would you like to come to my house for dinner tonight?——I'd love to , _____ I have lots of work to do .
小刚、小强两人练习赛跑,小刚每秒跑7米,小强每秒跑6.5米,小刚让小强先跑5米,设x秒钟后,小刚追上小强,下列四个方程中不正确的是( )