(9x²-81)÷(3x-9)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/01 14:27:31
![(9x²-81)÷(3x-9)](/uploads/image/z/8980057-1-7.jpg?t=%EF%BC%889x%26sup2%3B-81%EF%BC%89%C3%B7%EF%BC%883x-9%EF%BC%89)
(9x²-81)÷(3x-9)
(9x²-81)÷(3x-9)
(9x²-81)÷(3x-9)
9x²-81)÷(3x-9)=3x+9
(9x²-81)÷(3x-9)
=(3x-9)(3x+9)÷(3x-9)
=3x+9
(9x²-81)÷(3x-9)
=(3x-9)(3x+9)÷(3x-9)
=3x+9
这个和容易呀!(9x²-81)÷(3x-9)
=9(x²-9)÷3(x-3)
=9(x-3)(x+3)÷3(x-3)
=3(x+3)
=9(x²-9)/(3(x-3))=3(x+3)
平方差公式:(a+b)(a-b)=a^2-b^2