A=2XX+3XY-2X-1,B=-XX+XY-1,且3A+6B的值与x无关,试求y的值
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A=2XX+3XY-2X-1,B=-XX+XY-1,且3A+6B的值与x无关,试求y的值A=2XX+3XY-2X-1,B=-XX+XY-1,且3A+6B的值与x无关,试求y的值A=2XX+3XY-2X
A=2XX+3XY-2X-1,B=-XX+XY-1,且3A+6B的值与x无关,试求y的值
A=2XX+3XY-2X-1,B=-XX+XY-1,且3A+6B的值与x无关,试求y的值
A=2XX+3XY-2X-1,B=-XX+XY-1,且3A+6B的值与x无关,试求y的值
A=2x²+3xy-2x-1
B=-x²+xy-1
3A+6B=3(2x²+3xy-2x-1)+6(-x²+xy-1)
=6x²+9xy-6x-3-6x²+6xy-6
=15xy-6x-9
=(15y-6)x-9
∵此代数式的值与x无关,
∴15y-6=0
y=2/5
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