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合并同类项：
(1)$\frac {1}{4}ab^{2}-5a^{2}b-\frac {3}{4}a^{2}b+0.75ab^{2}$； (2)$\frac {1}{2}x^{2}-3xy^{2}+4y^{2}+\frac {1}{2}x^{2}+5xy^{2}$；
(3)$2x^{2}y-2xy-4xy^{2}+xy+4x^{2}y-3xy^{2}$； (4)$\frac {1}{3}m^{2}n-\frac {1}{2}mn^{2}-nm^{2}+\frac {1}{6}n^{2}m$；
(5)$(-\frac {1}{3}xy)+(-\frac {2}{5}x^{2})-\frac {1}{2}x^{2}-(-\frac {1}{6}xy)$；
(6)$-\frac {1}{5}xy^{2}-3x^{2}y+xy^{2}+2x^{2}y+3xy^{2}+x^{2}y-2xy^{2}$；
(7)$\frac {1}{3}x^{2}y-\frac {1}{2}xy^{2}+\frac {1}{2}xy^{2}+xy-x^{2}y$； (8)$2a^{3}b-\frac {1}{2}a^{3}b-a^{2}b+\frac {1}{2}a^{2}b-ab^{2}$；
(9)$3(n-m)^{2}-7(n-m)+8(n-m)^{2}+6(n-m)$；
(10)$-3(a-3b)^{3}+2(3b-a)^{2}+4(a-3b)^{2}+2(3b-a)^{3}$。
(1)$\frac {1}{4}ab^{2}-5a^{2}b-\frac {3}{4}a^{2}b+0.75ab^{2}$； (2)$\frac {1}{2}x^{2}-3xy^{2}+4y^{2}+\frac {1}{2}x^{2}+5xy^{2}$；
(3)$2x^{2}y-2xy-4xy^{2}+xy+4x^{2}y-3xy^{2}$； (4)$\frac {1}{3}m^{2}n-\frac {1}{2}mn^{2}-nm^{2}+\frac {1}{6}n^{2}m$；
(5)$(-\frac {1}{3}xy)+(-\frac {2}{5}x^{2})-\frac {1}{2}x^{2}-(-\frac {1}{6}xy)$；
(6)$-\frac {1}{5}xy^{2}-3x^{2}y+xy^{2}+2x^{2}y+3xy^{2}+x^{2}y-2xy^{2}$；
(7)$\frac {1}{3}x^{2}y-\frac {1}{2}xy^{2}+\frac {1}{2}xy^{2}+xy-x^{2}y$； (8)$2a^{3}b-\frac {1}{2}a^{3}b-a^{2}b+\frac {1}{2}a^{2}b-ab^{2}$；
(9)$3(n-m)^{2}-7(n-m)+8(n-m)^{2}+6(n-m)$；
(10)$-3(a-3b)^{3}+2(3b-a)^{2}+4(a-3b)^{2}+2(3b-a)^{3}$。
答案：
(1)$ab^{2}-\frac {23}{4}a^{2}b$
(2)$x^{2}+2xy^{2}+4y^{2}$
(3)$6x^{2}y-xy-7xy^{2}$
(4)$-\frac {2}{3}m^{2}n-\frac {1}{3}mn^{2}$
(5)$-\frac {1}{6}xy-\frac {9}{10}x^{2}$
(6)$\frac {9}{5}xy^{2}$
(7)$-\frac {2}{3}x^{2}y+xy$
(8)$\frac {3}{2}a^{3}b-\frac {1}{2}a^{2}b-ab^{2}$
(9)$11(n-m)^{2}-(n-m)$
(10)$-5(a-3b)^{3}+6(a-3b)^{2}$
(1)$ab^{2}-\frac {23}{4}a^{2}b$
(2)$x^{2}+2xy^{2}+4y^{2}$
(3)$6x^{2}y-xy-7xy^{2}$
(4)$-\frac {2}{3}m^{2}n-\frac {1}{3}mn^{2}$
(5)$-\frac {1}{6}xy-\frac {9}{10}x^{2}$
(6)$\frac {9}{5}xy^{2}$
(7)$-\frac {2}{3}x^{2}y+xy$
(8)$\frac {3}{2}a^{3}b-\frac {1}{2}a^{2}b-ab^{2}$
(9)$11(n-m)^{2}-(n-m)$
(10)$-5(a-3b)^{3}+6(a-3b)^{2}$
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