题319⑴2x2maxam
222xxyaxay⑵
2⑶7m3
m
21m
⑷03ax06ayx2y⑸10mx12
x5my6
y⑹axayxy
3232
222222axbxcxaybycy⑺
⑻2ax2ay3bx4cy3by4cx题320⑸a题321⑴
2
6ab9b16xy
2
22
223m37my7y⑹
xy
3
3
xy
22m1mm1
⑵
f2a⑶a12aa1a1
222⑷a4ab4bx2x1
22⑹1a1b4ab
22a8ab16b6a24b9⑺



22x2y3x7y4x2yxy⑻
题322
222axay2axyab⑴
22x6xy9y4x12y⑵
2229a18a9b4b4⑶
⑸
axby
4
2
2
aybx
24
2
⑹a
abb
222
22320xyyx20yxyy⑺
⑻x题323

2
ya
2

4xy
2
2
22
mmm
⑵
2
f2222abxyxyab⑶

⑷4m

2
2
m
2

2
x
22

42m2m⑸
⑺x
2
2mxm2
2x22mxm2
2

2
3211mm2216


422m2
2m8
8m
1⑻
题324
2222abcd2adbc⑶
222a4b9c4ab12bc6ac⑷2222⑸abc4d2ab4cd
⑹x
2
3x4x224x36
2

2
2yx36mx36my3m⑺
222a4bca2b4bcc⑻？
题326
222abc2ab2bc2acabc证明：2
题327
f3322ab0a2bab2ab已知，求的值
题328
222abcabacbc0，证明：若
则
abc
4x64⑴
4
题329
42⑵x7x1
3
⑶xx18⑷x3x2⑸3x7x4⑹x4x3⑺y11yy⑻aa1题330⑴xyxy30y⑵a5a5a4⑶x6x11x6⑷a4ab3b2bcc⑸x2x6x10x5⑹a3a50⑺yy3y4y4⑻axbxaxbx2abxabab题331⑴xy1x1y1xy⑵abcbcacab题332证明：ab2abab21aba1b1题333先化简，再求值：abcabcabcabc，其中
324
5
3
5
3
2
2
2
3
2
3
2
2
2
2
4
3
2
3
2
4
3
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
fa
45
，b25
444222222
题33r