式子：
a10 + b01 + 16/21 (7 a70 + b61) + 4/7 (a12 + 3 b03) h +
4/7 (5 a50 + b41) h + 4/21 (a32 + b23) (-2 + 3 h) +
16/231 (5 a52 + 3 b43) (1 + 3 h^2) +
16/231 (9 a90 + b81) (16 + 15 h^2) + (
16 (7 a72 + 3 b63) (16 + 44 h + 15 h^2))/3003 + (
64 (11 a110 + b101) (80 + 77 h + 75 h^2))/3003 + (
4 (a14 + 5 b05) (-28 + 33 h + 180 h^2))/1155 + (
16 (3 a34 + 5 b25) (15 - 209 h + 309 h^2))/15015 + (
16 (a54 + b45) (-112 - 152 h - 105 h^2 + 39 h^3))/3003 + (
64 (7 a74 + 5 b65) (80 + 205 h + 141 h^2 + 120 h^3))/15015 + (
32 (3 a92 + b83) (160 + 362 h + 150 h^2 + 195 h^3))/3003 + (
16 (3 a36 + 7 b27) (-272 - 532 h - 805 h^2 + 417 h^3))/21021 + (
8 (a16 + 7 b07) (142 - 630 h + 1152 h^2 + 2301 h^3))/21021 + (
32 (5 a56 + 7 b47) (160 + 298 h + 130 h^2 + 135 h^3 +
39 h^4))/21021 + (
64 (a38 + 3 b29) (80 + 13 h - 201 h^2 - 335 h^3 + 228 h^4))/9009 + (
16 (a18 + 9 b09) (-432 - 688 h - 1565 h^2 + 1434 h^3 +
2262 h^4))/27027 + (
32 (a110 + 11 b011) (160 - 406 h - 1090 h^2 - 2235 h^3 + 1890 h^4 +
2262 h^5))/33033
怎么让它化成（）h+（）h^2+......的形式， 就是以h为因式的形式。怎么办？