5道计算题..麻烦写出计算过程..
1.(1-xy)(-xy-1)
2.(-3ab²+2a²b)(3ab²+2a²b)
3.(a-1)(a+1)(a²+1)
4.(2x-3y-1)(2x+3y+1)
5.x(9x-5)-(3x+1)(3x-1)
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