一道数学题!!!!!!!!!!
①((x/2+3y)^2-(y/2+x)^2+(3x-y/2)^2-(x/2+3y)(3y-x/2))÷x/2②(6(x-y)^3(x+y)^4-9(x-y)^2(x+y...
①((x/2 +3y)^2 -(y/2+x)^2+(3x-y/2)^2-(x/2+3y)(3y-x/2))÷x/2
②(6(x-y)^3(x+y)^4-9(x-y)^2(x+y)^3)÷(3(x-y)(x+y)^2)
③(-2x^(a+1)+6x^(a+2)-12x^a)÷(-24x^(a-1)) 展开
②(6(x-y)^3(x+y)^4-9(x-y)^2(x+y)^3)÷(3(x-y)(x+y)^2)
③(-2x^(a+1)+6x^(a+2)-12x^a)÷(-24x^(a-1)) 展开
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