2x+y=24 xy=36 x=?y=?
1个回答
2x+36/x=24
x+18/x=12
x^2+18=12x
x^2-12x+18=0
x=6+3根号2,6-3根号2
y=36/x
y=12-6根号2,12+6根号2
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若x+y=10,xy=24,则x^2+y^2=?