x-y=9,xy=8,则x²+y²=?x^m=a,x^n=b,则x^(3m-2n)=?
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x-y=9,xy=8,则x²+y²=?x^m=a,x^n=b,则x^(3m-2n)=?
x-y=9,xy=8,则x²+y²=?x^m=a,x^n=b,则x^(3m-2n)=?
x-y=9,xy=8,则x²+y²=?x^m=a,x^n=b,则x^(3m-2n)=?
x2+y2=(x-y)2+2xy=81+16=97
x^(3m-2n)=x^3m/x^2n=a^3/b^2
(x-y)²=x²+y²-2xy=9²
所以x²+y²=81+2xy=99
x^(3m-2n)
=x^3m÷x^2n
=(x^m)³÷(x^n)²
=a³/b²
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xy=9,x-y=-3则x²+3xy+y²=
3x²-y²=8x²+xy+y²=4
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