# I.- División

 321. 322. $15x^{2}y^{3}:5$ $-80ab^{2}:4$
 323. 324. $-a^{5}:a^{3}$ $x^{m}:x^{n}$
 325. 326. $60x^{3}:12x^{2}$ $-36a^{5}b^{3}:-9a^{3}b^{3}$
 327. 328. $28a^{m}:-7a^{m-3}$ $30a^{x}b^{y}:15a^{x-2}b^{y-1}$
 329. $15x^{4}y^{3}c:5x^{2}y^{2}c$
 330. $20a^{5}b^{2}c^{3}\:&space;\:&space;:\:&space;\:&space;4a^{3}b^{2}c$
 331. $16a^{3}b^{2}x^{4}:-4a^{2}b^{2}x^{2}$
 332. $-20x^{3}y^{4}z^{2}:-5xy^{2}x$
 333. $8a^{4}b^{3}c^{2}:4a^{2}b^{3}c^{4}$
 334. $-25x^{5}y^{3}z:15x^{3}y^{2}v$
 335. $\frac{3}{4}am^{2}n^{3}:\frac{2}{5}a^{2}mn$
 336. $6x^{m}y^{n}:3x^{r}y^{s}$
 337. $(5a^{2}-4ab):a$
 338. $(6x^{3}y+8x^{2}y^{2}):x^{2}$
 339. $(15a^{2}b-10ab^{2}):5a$
 340. $\left&space;(&space;20xy^{2}+12x^{2}y^{3}&space;\right&space;)\:&space;:\:&space;4xy^{2}$
 341. $(a^{m}+ba^{m-1}-b^{2}a^{m-2}):a^{3}$
 342. $12a^{3}b-16a^{2}b^{2}+20ab^{3}:a^{3}$
 343. $25x^{4}y^{3}-10x^{5}y^{2}z-5x^{6}y^{4}+30x^{3}y^{3}z^{2}$ : $5x^{2}y$
 345. $8a^{4}b-2a^{3}b^{2}+4a^{2}b^{3}:-4a^{2}b$
 346. $\frac{3}{5}x^{4}y-\frac{2}{3}x^{3}y^{2}+6x^{2}y^{3}-\frac{1}{2}xy^{4}:\frac{3}{2}xy$
 347. $\frac{5}{8}a^{2}b^{3}-\frac{6}{10}a^{3}b^{4}+\frac{3}{5}a^{4}b^{5}-\frac{1}{3}a^{5}b^{2}$ $:\frac{3}{4}a^{2}b^{2}$
 349. $12a^{2}-29ab+15b^{2}:3a-5b$
 350. $-9b^{2}+27b-20:3b-5$
 351. $15a^{3}-25a^{2}b-9ab^{2}+15b^{3}\:&space;:\:&space;3a-5b$
 352. $-x^{4}y^{2}-2x^{2}y^{4}-y^{6}:x^{2}+y^{2}$
 353. $x^{5}-2x^{4}y+x^{3}y^{2}-x^{2}y^{3}+y^{5}:x^{2}+y^{2}$
 354. $6x^{4}-5x^{2}y^{2}-6y^{4}:2x^{2}-3y^{2}$
 355. $4x^{3}+4x^{2}-29x+21\:&space;:\:&space;2x-3$
 356. $a^{4}-9y^{2}a^{3}-6ayz^{2}-z^{4}:a^{2}-3ya-z^{2}$
 357. $12ax^{5}-9a^{2}x^{4}+5a^{3}x:4ax^{2}-3a^{2}x$
 358. $\bg_black&space;x^{6}+2x^{3}y^{3}+y^{6}:x^{2}-xy+y&space;^{2}$
 359. $125a^{3}-8b^{3}:5a-2b$
 360. $4b^{2}-9a^{2}b^{2}+6a^{3}b-a^{4}:2b^{2}-3ab+a^{2}$
 361. $x^{4}-x^{3}y+x^{2}y^{2}-xy^{3}:x^{2}+y^{2}$
 362. $x^{5}-2x^{4}y+x^{3}y^{2}-x^{2}y^{3}+y^{5}$ $:x^{2}-2x^{2}y+y^{3}$
 363. $2x^{4}-13x^{3}y+31x^{2}y^{2}-38xy^{3}+24y^{4}$  : $x^{2}-5xy+6y^{2}$
 364. $a^{4}-4a^{3}b+6a^{2}b^{3}-4ab^{3}+b^{4}:$  $a^{3}-3a^{2}b+3ab^{2}-b^{3}$
 365. $a^{5}-b^{5}:a-b$

Soluciones