1.(x^2-2y)(xy^2)^2=2.(3x-2)(3-5x)的展开式中,二次项系数为(),一次项系数为
3.8x^6-6x^6+12x^5+6x^44.(x+2)(y-3)-(x-1)(y+2)5.(a-6)(a^2+b^2)(a+b)6.(x+2y)^2(x-2y)^27.(a-2b+3c)(a-2b-3c)