若(x-1)(y+1)=3,xy(x-y)=4,求x的7次方减去y的7次方的值.一定要有详细的解法,答案也得是对的.(悬赏金在等着你们)
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若(x-1)(y+1)=3,xy(x-y)=4,求x的7次方减去y的7次方的值.一定要有详细的解法,答案也得是对的.(悬赏金在等着你们)若(x-1)(y+1)=3,xy(x-y)=4,求x的7次方减去
若(x-1)(y+1)=3,xy(x-y)=4,求x的7次方减去y的7次方的值.一定要有详细的解法,答案也得是对的.(悬赏金在等着你们)
若(x-1)(y+1)=3,xy(x-y)=4,求x的7次方减去y的7次方的值.
一定要有详细的解法,答案也得是对的.(悬赏金在等着你们)
若(x-1)(y+1)=3,xy(x-y)=4,求x的7次方减去y的7次方的值.一定要有详细的解法,答案也得是对的.(悬赏金在等着你们)
(x-1)(y+1)=3
即xy+(x-y)=4
又xy(x-y)=4
则xy,(x-y)是方程z^2-4x+4=0的解,
xy=2,x-y=2
(x+y)^2=(x-y)^2+4xy=12
x+y=2√3或x+y=-2√3
x=√3+1,y=√3-1
或x=1-√3,y=-1-√3
x^7-y^7自己带入吧!
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