(1)9X?—y?(2)x?-6x+9(3)M-5m-6(4)a-4ab+4b?
(5)12x?-13x+3;
(6)4x?+24x+27.
(7)6x?-13xy+6y?;
(8)8x?+6xy-35;
(9)18x?-21xy+5y?;
(10)2(a+b)+(a+b)(a-b)-6(a-b)
(11)2x?+3x+1;
(12)2y?+y-6;
(13)6x?-13x+6;
(14)3a?-7a-6;
(15)6x?-11xy+3y?;
(16)4m?+8mn+3n?;
(17)10x?-21xy+2y?;
(18)8m?-22mn+15n
(19)4n?+4n-15;
(20)6a?+a-35;
(21)5x?-8x-13;
(22)4x?+15x+9
(23)15x?+x-2;
(24)6y?+19y+10;
(25)20-9y-20y?;
(26)7(x-1)?+4(x-1)(y+2)-20(y+2)
(27)ax+ay+bx+by
(28)x?-x-y?-y(29)9a?-5(30)b?-10ab+25