若x+y=6,x-y=4则y2-x2
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若x+y=6,x-y=4则y2-x2
若x+y=6,x-y=4则y2-x2
若x+y=6,x-y=4则y2-x2
解得x=5,y=1
y2-x2=-24.
您好:
y2-x2=(y+x)(y-x)
x-y=4所以:y-x= -4
(y+x)(y-x)
=6x(-4)
= -24
有不明白的可以追问!如果有其他需要帮助的题目,您可以求助我。谢谢!!
y2-x2=-(x2-y2)
=-(x+y)(x-y)
=-6x4
=-24
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