初一下课时导航70页题若(x-1/x)+B=(x+1/x)^2,则B=________(a+b)^2=(a-b)^2+______若(x+y)^2=9,(x-y)^2=5,则xy=_______若x^2+1/x^2=7,则x+1/x=_______

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初一下课时导航70页题若(x-1/x)+B=(x+1/x)^2,则B=________(a+b)^2=(a-b)^2+______若(x+y)^2=9,(x-y)^2=5,则xy=_______若x^

初一下课时导航70页题若(x-1/x)+B=(x+1/x)^2,则B=________(a+b)^2=(a-b)^2+______若(x+y)^2=9,(x-y)^2=5,则xy=_______若x^2+1/x^2=7,则x+1/x=_______
初一下课时导航70页题
若(x-1/x)+B=(x+1/x)^2,则B=________
(a+b)^2=(a-b)^2+______
若(x+y)^2=9,(x-y)^2=5,则xy=_______
若x^2+1/x^2=7,则x+1/x=_______

初一下课时导航70页题若(x-1/x)+B=(x+1/x)^2,则B=________(a+b)^2=(a-b)^2+______若(x+y)^2=9,(x-y)^2=5,则xy=_______若x^2+1/x^2=7,则x+1/x=_______
B=(x+1/x)^2-(x-1/x)
(a+b)^2=(a-b)^2+4ab
若(x+y)^2=9,(x-y)^2=5,则xy=1
若x^2+1/x^2=7,则x+1/x=±3