x+2y=3 xy=2 则x²+4y²=?急...
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x+2y=3 xy=2 则x²+4y²=?急...
x+2y=3 xy=2 则x²+4y²=?
急...
x+2y=3 xy=2 则x²+4y²=?急...
x^2+4y^2
=x^2+(2y)^2+2x*(2y)-2x*(2y)
=[x+(2y)]^2-4xy
=9-8
=1