若|3x+y+5|+|2x-2y-2|=0,则2x²-3xy的值是______如题,²是平方的意思.

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若|3x+y+5|+|2x-2y-2|=0,则2x²-3xy的值是______如题,²是平方的意思.若|3x+y+5|+|2x-2y-2|=0,则2x²-3xy的值是___

若|3x+y+5|+|2x-2y-2|=0,则2x²-3xy的值是______如题,²是平方的意思.
若|3x+y+5|+|2x-2y-2|=0,则2x²-3xy的值是______
如题,²是平方的意思.

若|3x+y+5|+|2x-2y-2|=0,则2x²-3xy的值是______如题,²是平方的意思.
绝对值大于等于0,相加等于0
若有一个大于0,则另一个小于0,不成立.
所以两个都等于0
所以3x+y+5=0
2x-2y-2=0
所以x=-1,y=-2
所以2x²-3xy
=2-6
=-4

3x+y+5＝0
2x-2y-2＝0
得到x=-1,y=-2
代入得到值为－4

|3x+y+5|+|2x-2y-2|=0
3x+y+5=0
2x-2y-2=0
x=-1
y=-2
2x²-3xy
=x(2x-3y)
=-(-2+6)
=-4

3x+y+5=0
2x-2y-2=0
解得x=-1 y=-2
原式=2-6=-4

由于绝对值号的算术值大于等于0，所以有
3x+y+5=0
2x-2y-2=0 解得x=-1 y=-2
所以2x²-3xy的值是-4

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