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(1)$3a^{2}-2a+4a^{2}-7a$; (2)$xy+7xy-5xy$;
(3)$-5a-2b+7a+9b$; (4)$2x-7y-5x+11y-1$;
(5)$-3a+2ab-4ab+2a$; (6)$4a^{2}+3b^{2}+2ab-2a^{2}+4b^{2}-ab$;
(7)$m^{2}-3mn^{2}+\frac {1}{2}n^{2}+m^{2}+5mn^{2}-\frac {1}{2}n^{2}$;
(8)$7ab-3a^{2}b^{2}+7+8ab^{2}+3a^{2}b^{2}-3-7ab-5ab^{2}$.
(3)$-5a-2b+7a+9b$; (4)$2x-7y-5x+11y-1$;
(5)$-3a+2ab-4ab+2a$; (6)$4a^{2}+3b^{2}+2ab-2a^{2}+4b^{2}-ab$;
(7)$m^{2}-3mn^{2}+\frac {1}{2}n^{2}+m^{2}+5mn^{2}-\frac {1}{2}n^{2}$;
(8)$7ab-3a^{2}b^{2}+7+8ab^{2}+3a^{2}b^{2}-3-7ab-5ab^{2}$.
答案：
(1)$7a^{2}-9a$
(2)$3xy$
(3)$2a+7b$
(4)$-3x+4y-1$
(5)$-a-2ab$
(6)$2a^{2}+7b^{2}+ab$
(7)$2m^{2}+2mn^{2}$
(8)$3ab^{2}+4$
(1)$7a^{2}-9a$
(2)$3xy$
(3)$2a+7b$
(4)$-3x+4y-1$
(5)$-a-2ab$
(6)$2a^{2}+7b^{2}+ab$
(7)$2m^{2}+2mn^{2}$
(8)$3ab^{2}+4$
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