(2)(x-2)(x+2)-(x+1)(x-3)
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(2)(x-2)(x+2)-(x+1)(x-3)
(3) (ab+1)²-(ab-1)²
(4)(2x-y)²-4(x-y)(x+2y)
(3) (ab+1)²-(ab-1)²
(4)(2x-y)²-4(x-y)(x+2y)
![(2)(x-2)(x+2)-(x+1)(x-3)](/uploads/image/z/3552020-44-0.jpg?t=%EF%BC%882%29%28x-2%29%28x%2B2%29-%28x%2B1%29%28x-3%29)
(2)(x-2)(x+2)-(x+1)(x-3)
=x²-4-(x²-2x-3)
=x²-4-x²+2x+3
=2x-1
(3) (ab+1)²-(ab-1)²
=(ab+1+ab-1)(ab+1-ab+1)
=2(2ab)
=4ab
(4)(2x-y)²-4(x-y)(x+2y)
=4x²-4xy+y²-4(x²+xy-2y²)
=4x²-4xy+y²-4x²-4xy+8y²
=-8xy+9y²
=x²-4-(x²-2x-3)
=x²-4-x²+2x+3
=2x-1
(3) (ab+1)²-(ab-1)²
=(ab+1+ab-1)(ab+1-ab+1)
=2(2ab)
=4ab
(4)(2x-y)²-4(x-y)(x+2y)
=4x²-4xy+y²-4(x²+xy-2y²)
=4x²-4xy+y²-4x²-4xy+8y²
=-8xy+9y²
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