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Nice trick
58
X^2 + Y^2 = ? X+Y= 10 XY=21 (a+b)^2 = a^2 +2ab + b^2 (x+y)^2=x^2+2xy+y^2 10^2=x^2+y^2+(2 . 21) 100=x^2+y^2+42 x^2+y^2=100-42 x^2+y^2=58
X=3. Y=7 故 X^2+Y^2=58
Пікірлер: 4
Nice trick
58
X^2 + Y^2 = ? X+Y= 10 XY=21 (a+b)^2 = a^2 +2ab + b^2 (x+y)^2=x^2+2xy+y^2 10^2=x^2+y^2+(2 . 21) 100=x^2+y^2+42 x^2+y^2=100-42 x^2+y^2=58
X=3. Y=7 故 X^2+Y^2=58