化简.(7-5√2) (-7-5√2)

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化简.(7-5√2) (-7-5√2)
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化简.(7-5√2) (-7-5√2)
化简.(7-5√2) (-7-5√2)

化简.(7-5√2) (-7-5√2)
=-7-5√2

-7-5√2

-7-5√2

(7-5√2) (-7-5√2)=-(7-5√2) (7+5√2)=-[7^2-(5√2)^2)]=-(49-50)=1

(7-5√2) (-7-5√2)
=(5√2-7) (5√2+7)
=50-49
=1