x+y=5,xy=6,(x-y)的平方=?

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x+y=5,xy=6,(x-y)的平方=?x+y=5,xy=6,(x-y)的平方=?x+y=5,xy=6,(x-y)的平方=?(x-y)^2=(x+y)^2-4xy=5^2-4*6=25-24=1(x

x+y=5,xy=6,(x-y)的平方=?
x+y=5,xy=6,(x-y)的平方=?

x+y=5,xy=6,(x-y)的平方=?
(x-y)^2
=(x+y)^2-4xy
=5^2-4*6
=25-24
=1

(x-y)²
=(x+y)²-4xy
=5²-26
=-1

(x-y)²
=(x+y)²-4xy
=5²-4*6
=25-24
=1

-1