1因式分解分式计算题专题过关训练因式分解 1将下列各式分解因式(1)3p 26pq (2)2x 2+8x+8(3)x 3yxy (4)3a 36a 2b+3ab2(5)a 2(xy)+16(yx) (6) (x 2+y2) 24x 2y2(7)2x 2x (8)16x 21 (9)6xy 29x 2yy 3 (10)4+12(xy)+9(xy) 2 (11)2am 28a (12)4x 3+4x2y+xy2 (13)3x12x 3 (14) (x 2+y2) 24x 2y2 (15)x 2y2xy 2+y3 (16) (x+2y) 2y 2 (17)n 2(m2)n(2m) (18) (x1) (x3)+1 (19)a 24a+4b 2 2(20) a 2b 22a+1 (21) ; 212019363(22) . (23) 80.737325 6372x(24) (25)2x 2y8xy8y )()(2xybxa(26) (27)9(3m+2n) 2-4(m-2n )322 (28) (y 2-1) 2+6(1-y 2)+9 (29)25015(30) 7.362.5.3824. (31)先因式分解,再求值:其中),3(4)3(22ayxax 1,3,1yxa分式的计算(x+y)3=0 =1; =0