答：
1.原式=(2x+3)(x+2)
2.原式=(3x-1)(x+6)
3.原式=(6x+1)(x-3)
4.原式=(x^2-9)(x^2-1)=(x+3)(x-3)(x+1)(x-1)
5.原式=(x^2-4)(x^2-2)=(x+2)(x-2)(x^2-2)=(x+2)(x-2)(x+√2)(x-√2)如果没学根号就要上一步不要这步.
6.原式=(5x-2y)(9x+y)
7.原式=(2a-3b)(6a-5b)
8.原式=(3(p-q)-1)^2=(3p-3q-1)^2
9.提公因,再十字相乘法.
原式
=(x+y)[7(x+y)^2-5(x+y)-2]
=(x+y)[7(x+y)+2][(x+y)-1]
=(x+y)(7x+7y+2)(x+y-1)