求(x+y)(x-y)(x的2次方+y的2次方)的值,其中x=5,y=2我想要过程,请快点!答案是609!
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求(x+y)(x-y)(x的2次方+y的2次方)的值,其中x=5,y=2我想要过程,请快点!答案是609!
求(x+y)(x-y)(x的2次方+y的2次方)的值,其中x=5,y=2
我想要过程,请快点!答案是609!
求(x+y)(x-y)(x的2次方+y的2次方)的值,其中x=5,y=2我想要过程,请快点!答案是609!
(x+y)(x-y)(x的2次方+y的2次方)
=(x²-y²)(x²+y²)
=x^4-y^4
=5^4-2^4
=625-16
=609
^表示乘方
=(x的2次方-y的2次方)(x的2次方+y的2次方)
=x的4次方-y的4次方
=625+16
=609
原式=(x^2-y^2)(x^2+y^2)
=x^4-y^4
=625-16=609
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