(x平方-9)除以(x-3)等于多少

问题描述:

(x平方-9)除以(x-3)等于多少

(x²-9)÷(x-3)
=(x+3)(x-3)÷(x-3)
=x+3

x*x-9=(x-3)*(x+3)

(x平方-9)除以(x-3)
=(x+3)(x-3)除以(x-3)
=x+3
不懂的欢迎追问,

原式=(x+3)(x-3)÷(x-3)
=x+3