若x+y=5,xy=2,则x2+y2=___
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若x+y=5,xy=2,则x2+y2=___若x+y=5,xy=2,则x2+y2=___若x+y=5,xy=2,则x2+y2=___因为x+y=5xy=2所以x²+y²=(x
若x+y=5,xy=2,则x2+y2=___
若x+y=5,xy=2,则x2+y2=___
若x+y=5,xy=2,则x2+y2=___
因为
x+y=5
xy=2
所以
x²+y²
=(x²+2xy+y²)-2xy
=(x+y)²-2xy
=5²-2×2
=25-4
=21
x²+y²
=(x+y)²-2xy
=25-4
=21
21
x2+y2=(x+y)^2-2xy=25-4=21
21
x^2+y^2=[x+y]^2-2xy=25-4=21
x² + y ² =(x + y)² - 2xy=25-4=21
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