问题:

计算:
(1)(x 28•x 4÷x 10-2x 5•(x 32÷x.
(2)3a 3b 2÷a 2+b•(a 2b-3ab-5a 2b).
(3)(x-3)(x+3)-(x+1)(x+3).
(4)(2x+y)(2x-y)+(x+y) 2-2(2x 2-xy).

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