已知-3

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已知-3
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已知-3
已知-3

已知-3
:|y-2|+|y+3|-|3y+9|-|2y-4|
=(2-y)+(y+3)-(3y+9)-(4-2y)
=-y-8
因为:-3

y-2<0
y+3>0
3y+9>0
2y-4<0
答案为2-y+y+3-3y-9-4+2y=-y-8

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