Ответ:
а)
[tex](x - y) {}^{2} - y {}^{2} \\ x {}^{2} - 2xy + y {}^{2} - y {}^{2} \\ x {}^{2} - 2xy[/tex]
б)
[tex]c {}^{3} + d {}^{3} - 3cd(c + d) \\ c {}^{3} + d {}^{3} - 3c {}^{2} d - 3cd \\ (c + d) \times (c {}^{2} - cd + d {}^{2} ) - 3cd \times (c + d) \\ (c + d) \times (c {}^{2} - cd + d {}^{2} - 3cd) \\ (c + d)(c {}^{2} - 4cd + d {}^{2} )[/tex]
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Answers & Comments
Ответ:
а)
[tex](x - y) {}^{2} - y {}^{2} \\ x {}^{2} - 2xy + y {}^{2} - y {}^{2} \\ x {}^{2} - 2xy[/tex]
б)
[tex]c {}^{3} + d {}^{3} - 3cd(c + d) \\ c {}^{3} + d {}^{3} - 3c {}^{2} d - 3cd \\ (c + d) \times (c {}^{2} - cd + d {}^{2} ) - 3cd \times (c + d) \\ (c + d) \times (c {}^{2} - cd + d {}^{2} - 3cd) \\ (c + d)(c {}^{2} - 4cd + d {}^{2} )[/tex]