异分母分式混合运算
1.x-y+y^2/(x+y)2.2/(a+1)-(a-2)/(a^2-1)
3.(x^2-16y^2)/8x^2y^3*(4x^2y^2)/(x+4y)
4.(x-1)/(x^2+x)÷(x+1)/(x^3+2x^2+x)
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