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38、am-an+ap 39、25x^2+20xy+4y^2 40、(-4m^4+20m^3n-m^2n^2)÷(-4m^2) 41、(12p^3q^4+20p^3q^2r-6p^4q^3)÷(-2pq)^2 42、[4y(2x-y)-2x(2x-y)]÷(2x-y) 43、(x^2y^3-1/2 x^3y^2+2x^2y^2)÷1/2 xy^2 44、(4a^3b^3-6a^2b^3c-2ab^5)÷(-2ab^2) 45...