помогите алгебра 7 класс
[tex](a + x) {}^{2} \\ (b - 2) {}^{2} \\ (7 - c) {}^{2} \\ (6 - d) {}^{2} \\ [/tex]
пж
[tex](a + x) {}^{2} \\ (b - 2) {}^{2} \\ (7 - c) {}^{2} \\ (6 - d) {}^{2} \\ [/tex]
пж
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(b-2)²=b²-4b+4
(7-c)²=49-14c+c²
(6-d)²=36-12c+c²