Ответ:
Объяснение:
1) (3m - 2n)² + 5m(4n - m) = 9m² - 12mn + 4n² + 20mn - 5m² =
= 4m² +8mn + 4n² = (2m + 2n)²
2) (9x + 2y)²- (8x + 3y)(4x - 4y) =
= 81х² + 36ху + 4у²- (32х² + 12ху - 32ху - 12у²) =
= 81х² + 36ху + 4у²- 32х² + 20 ху + 12у² = 49х² + 56ху + 16у² =
=(7х + 4у)²
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Ответ:
Объяснение:
1) (3m - 2n)² + 5m(4n - m) = 9m² - 12mn + 4n² + 20mn - 5m² =
= 4m² +8mn + 4n² = (2m + 2n)²
2) (9x + 2y)²- (8x + 3y)(4x - 4y) =
= 81х² + 36ху + 4у²- (32х² + 12ху - 32ху - 12у²) =
= 81х² + 36ху + 4у²- 32х² + 20 ху + 12у² = 49х² + 56ху + 16у² =
=(7х + 4у)²