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katytixomirova
@katytixomirova
July 2022
2
9
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m2+n2
если m+n=9
mn=18
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rubilovalex
M + n = 9
(m + n)² = 9²
m² + 2mn + n² = 81
m² + n² = 81 - 2mn = 81 - 2 * 18 = 81 - 36 = 45
m² + n² = 45
3 votes
Thanks 6
Universalka
Verified answer
M^2+2mn+n^2-2mn=(m+n)^2-2mn. подставляем значения: 9^2-2*18=81-36=45. Ответ: 45.
9 votes
Thanks 18
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Answers & Comments
(m + n)² = 9²
m² + 2mn + n² = 81
m² + n² = 81 - 2mn = 81 - 2 * 18 = 81 - 36 = 45
m² + n² = 45
Verified answer
M^2+2mn+n^2-2mn=(m+n)^2-2mn. подставляем значения: 9^2-2*18=81-36=45. Ответ: 45.