Cách làm cho bạn:
a) (4x$^{2}$ + 4xy + y$^{2}$) : (2x + y) = (2x + y)$^{2}$ : (2x + y) = 2x + y;
b) (27x$^{3}$ + 1) : (3x + 1) = (3x + 1)(9x$^{2}$ - 3x + 1) : (3x + 1) = 9x$^{2}$ - 3x + 1;
c) (x$^{2}$ - 6xy + 9y$^{2}$) : (3y – x) = (x – 3y)$^{2}$ : [-(x – 3y)] = -(x – 3y);
d) (8x$^{3}$ - 1) : (4x$^{2}$ + 2x + 1) = (2x – 1)(4x$^{2}$ + 2x + 1) : (4x$^{2}$ + 2x + 1) = 2x – 1.
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