已知-3
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已知-3
已知-3
已知-3
-3
|y-2|+|y+3|-|3y+9|-|2y-4|
=2-y+y+3-3y-9+4-2y
=-5y
|y-2|+|y+3|-|3y+9|-|2y-4|
=2-y+y+3-3(y+3)-2(2-y)
=-(2-y)-2(y+3)
=-2+y-2y-6
=-8-y
-y-8