求过程(2x-y)(2x+y)+2x(x-2y) (x/2+3)²-(x/2-3)² (2a-b)&
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求过程(2x-y)(2x+y)+2x(x-2y) (x/2+3)²-(x/2-3)² (2a-b)²-4(a+b)(a-2b)
![求过程(2x-y)(2x+y)+2x(x-2y) (x/2+3)²-(x/2-3)² (2a-b)&](/uploads/image/z/17817956-44-6.jpg?t=%E6%B1%82%E8%BF%87%E7%A8%8B%282x-y%29%282x%2By%29%2B2x%28x-2y%29+%28x%2F2%2B3%29%26%23178%3B-%EF%BC%88x%2F2-3%29%26%23178%3B+%282a-b%29%26)
(2x-y)(2x+y)+2x(x-2y)
=4x²-y²+2x²-4xy
=6x²-4xy-y²
(x/2+3)²-(x/2-3)²
=(x/2+3+x/2-3)(x/2+3-x+3)
=6x
(2a-b)²-4(a+b)(a-2b)
=4a²-4ab+b²-4(a²-ab-2b²)
=9b²
=4x²-y²+2x²-4xy
=6x²-4xy-y²
(x/2+3)²-(x/2-3)²
=(x/2+3+x/2-3)(x/2+3-x+3)
=6x
(2a-b)²-4(a+b)(a-2b)
=4a²-4ab+b²-4(a²-ab-2b²)
=9b²
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