(-x+y)(x-y) (3a+b)(-3a-b) (a-b+c)(a-b-c)
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(-x+y)(x-y) (3a+b)(-3a-b) (a-b+c)(a-b-c)
(-x+y)(x-y) (3a+b)(-3a-b) (a-b+c)(a-b-c)
(-x+y)(x-y) (3a+b)(-3a-b) (a-b+c)(a-b-c)
(-x+y)(x-y)
=[-(x-y)](x-y)
=-(x-y)²
=-(x²-2xy+y²)
=-x²+2xy-y²
(3a+b)(-3a-b)
=(3a+b)[-(3a+b)]
=-(3a+b)²
=-(9a²+6ab+b²)
=-9a²-6ab-b²
(a-b+c)(a-b-c)
=[(a-b)+c][(a-b)-c]
=(a-b)²-c²
=a²-2ab+b²-c²
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(-x+y)(x-y) (3a+b)(-3a-b) (a-b+c)(a-b-c)=(x-y)平方(3a+b)平方【(a-b)平方-c平方】=
太容易了(-x+y)(x-y)
=[-(x-y)](x-y)
=-(x-y)²
=-(x²-2xy+y²)
=-x²+2xy-y²
(3a+b)(-3a-b)
=(3a+b)[-(3a+b)]
=-(3a+b)²
=-(9a²+6ab+b²)<...
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太容易了(-x+y)(x-y)
=[-(x-y)](x-y)
=-(x-y)²
=-(x²-2xy+y²)
=-x²+2xy-y²
(3a+b)(-3a-b)
=(3a+b)[-(3a+b)]
=-(3a+b)²
=-(9a²+6ab+b²)
=-9a²-6ab-b²
(a-b+c)(a-b-c)
=[(a-b)+c][(a-b)-c]
=(a-b)²-c²
=a²-2ab+b²-c²
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