作业帮y(y+4)-y(y-3)-9y详细解答
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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