因式分解的数学题求解
2个回答
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X^2-X=5
X^2-X-5=0
X1=1/2+(1/4+5)^0.5=1/2+21^0.5/2
X2=1/2-(1/4+5)^0.5=1/2-21^0.5/2
Y^2-Y=5
Y^2-Y-5=0
Y1=1/2+(1/4+5)^0.5=1/2+21^0.5/2
Y2=1/2-(1/4+5)^0.5=1/2-21^0.5/2
由于X≠Y,所以取X1和Y2或X2和Y1!
X^2+2*XY+Y^2
=(X+Y)^2
=(X1+Y2)^2
=1
=(X2+Y1)^2
=1
X^2-X-5=0
X1=1/2+(1/4+5)^0.5=1/2+21^0.5/2
X2=1/2-(1/4+5)^0.5=1/2-21^0.5/2
Y^2-Y=5
Y^2-Y-5=0
Y1=1/2+(1/4+5)^0.5=1/2+21^0.5/2
Y2=1/2-(1/4+5)^0.5=1/2-21^0.5/2
由于X≠Y,所以取X1和Y2或X2和Y1!
X^2+2*XY+Y^2
=(X+Y)^2
=(X1+Y2)^2
=1
=(X2+Y1)^2
=1
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