it is great to see you h__ is your new school america

问题描述:

it is great to see you h__ is your new school america
x(x+1)=7和x-7=x-8+1是不是一元一次方程

x(x+1)=7 是一元二次方程,后面那个左右一消还用解吗,不清楚,一定算方程的话也只能是一元一次方程了