若XY=3,X+Y=1/4则X+(XY-4X-3Y)的值
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若XY=3,X+Y=1/4则X+(XY-4X-3Y)的值若XY=3,X+Y=1/4则X+(XY-4X-3Y)的值若XY=3,X+Y=1/4则X+(XY-4X-3Y)的值方法1:X+(XY-4X-3Y)
若XY=3,X+Y=1/4则X+(XY-4X-3Y)的值
若XY=3,X+Y=1/4则X+(XY-4X-3Y)的值
若XY=3,X+Y=1/4则X+(XY-4X-3Y)的值
方法1:
X+(XY-4X-3Y)
=x+(xy-4x-4y+y)
=x+[xy-4(x+y)+y]
=x+3-1+y
=2+1/4
=4/9
方法2:
x+(xy-4x-3y)=x+xy-4x-3y=xy-3x-3y=xy-3(x+y)=3-3*1/4=9/4
x+(xy-4x-3y)=x+xy-4x-3y=xy-3x-3y=xy-3(x+y)=3-3*1/4=9/4
x+(xy-4x-3y)=x+xy-4x-3y=xy-3x-3y=xy-3(x+y)=3-3*1/4=9/4
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答案是9/4。XY的值呢不用分别求,反正是个虚数,直接带进去就可以得到结果了。最后弱弱的问下,题目没问题吧?似乎太简单了的说
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