作业帮y(y+4)-y(y-3)-9y详细解答
来源：学生作业帮助网 编辑：作业帮 时间：2024/12/01 07:21:10
x)Ԩ6Rƚ//{NI*P DQ_`gCA@Q]X,T RRXR&keU$A-spaH;iOv4<ٱ醍O?ٽɮ6l*gc'-qF& ʸ.jR3G0aר|>ϦɎll?قMGr DN
y(y+4)-y(y-3)-9y详细解答
y(y+4)-y(y-3)-9y
详细解答
y(y+4)-y(y-3)-9y详细解答
y(y+4)-y(y-3)-9y
=y[y+4-(y-3)-9]
=y(y+4-y+3-9)
=y(-2)
=-2y
y(y+4)-y(y-3)-9y
=y(y+4-y+3-9)
=-2y
提取一个y就可以了
1 ok
-2y
y(y+4)-y(y-3)-9y
=y^2+4y-y^2+3y-9y
=4y+3y-9y
=7y-9y
=-2y
y^2(y的平方)
不知道是否这样算