已知x+y=7,xy=9求(x-y)^2的值
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已知x+y=7,xy=9求(x-y)^2的值已知x+y=7,xy=9求(x-y)^2的值已知x+y=7,xy=9求(x-y)^2的值(x-y)²=x²+y²-2xy=x&
已知x+y=7,xy=9求(x-y)^2的值
已知x+y=7,xy=9求(x-y)^2的值
已知x+y=7,xy=9求(x-y)^2的值
(x-y)²
=x²+y²-2xy
=x²+y²+2xy-4xy
=(x+y)²-4xy
=7²-4*9
=13
(x-y)^2
=(x+y)^2-4xy
=7^2-4x9
=49-36
=13
(x-y)^2=(x+y)^2-4xy=49-36=13
(x-y)^2=(x+y)²-4xy=49-36=13
13
x+y=7 则 (x+y)^2=x^2+y^2+2xy=49 则 x^2+y^2=31
(x-y)^2=x^2+y^2-2xy=13
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