(1).(x+a)(x+b)(2).(3x+7y)(3x-7y)(3).(3x+9)(6x+8)(4).(1/2x^2y-2xy+y^2)·3xy(5).(1/3a^2b^3)·(-15a^2b^2)(6).(4a^3b-6a^2b^2+12ab^3)÷(2ab)(7).(a^2bc)^2÷(ab^2c)(8).(3mn+1)(3mn-1)-8m^2n^2(9).[(3a+b)^2-b^2]÷a(10).(x+2)^2-(x+1)(x-1)
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