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化简下列各式:
(1)$\frac {1}{3}(9y-3)+2(y+1)$; (2)$2(2a-3b)-3(2b-3a)$;
(3)$5a+(2a^{2}-3ab)-2(ab-2a^{2})$; (4)$2(2x^{2}+x-3)-(x^{2}+2x-2)$;
(5)$5(a^{2}b-3ab^{2})-2(a^{2}b-7ab)$; (6)$(-2ab+3a)-2(2a-b)+2ab$;
(7)$(x^{2}-xy+y)-3(x^{2}+xy-2y)$; (8)$2(6m^{2}+4m-3)-3(2m^{2}-3m+1)$.
(1)$\frac {1}{3}(9y-3)+2(y+1)$; (2)$2(2a-3b)-3(2b-3a)$;
(3)$5a+(2a^{2}-3ab)-2(ab-2a^{2})$; (4)$2(2x^{2}+x-3)-(x^{2}+2x-2)$;
(5)$5(a^{2}b-3ab^{2})-2(a^{2}b-7ab)$; (6)$(-2ab+3a)-2(2a-b)+2ab$;
(7)$(x^{2}-xy+y)-3(x^{2}+xy-2y)$; (8)$2(6m^{2}+4m-3)-3(2m^{2}-3m+1)$.
答案：
(1)5y+1
(2)13a-12b
(3)5a+6a²-5ab
(4)3x²-4
(5)3a²b-15ab²+14ab
(6)-a+2b
(7)-2x²-4xy+7y
(8)6m²+17m-9
(1)5y+1
(2)13a-12b
(3)5a+6a²-5ab
(4)3x²-4
(5)3a²b-15ab²+14ab
(6)-a+2b
(7)-2x²-4xy+7y
(8)6m²+17m-9
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