用整式除法计算,1.(5x^2y^3)^2÷(25x^4y^5) 2.(x+y)^3÷(x+y) 3.(7a^5b^3c^5)÷(14a^2b^3c) 4.(8a^4b^3c)÷(2a^2b^3)·(-2/3a^3bc^2) 5.(3x^2y)·(-15xy^3)÷(-9x^4y^2)用整式除法计算,
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