计算,x²(x-9)= (2a+1)(a+2)+x²(x-9)= (2a+1)(a+2)=

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/19 06:24:38
计算,x²(x-9)=(2a+1)(a+2)+x²(x-9)=(2a+1)(a+2)=计算,x²(x-9)=(2a+1)(a+2)+x²(x-9)=(2a+1)

计算,x²(x-9)= (2a+1)(a+2)+x²(x-9)= (2a+1)(a+2)=
计算,x²(x-9)= (2a+1)(a+2)+
x²(x-9)=
(2a+1)(a+2)=

计算,x²(x-9)= (2a+1)(a+2)+x²(x-9)= (2a+1)(a+2)=
x²(x-9)=x²·x-x²·9=x³-9x²
(2a+1)(a+2)
=2a·a+2a·2+1·a+1·2
=2a²+4a+a+2
=2a²+5a+2