1) (3x - 8y)² = 9х² - 48ху + 64у²
2) (3,5t - 4k)² = 12,25t² - 28tk + 16k²
3) (2/3 a - 3/7 b) = 4a²/9 - 4ab/7 + 9b²/49
4) (7/8 c - 4/7 d) = 49c²/64 - cd + 16d²/49
1) (3x - 8y)² = 9х² - 48ху + 64у²
2) (3,5t - 4k)² = 12,25t² - 28tk + 16k²
3) (2/3 a - 3/7 b) = 4a²/9 - 4ab/7 + 9b²/49
4) (7/8 c - 4/7 d) = 49c²/64 - cd + 16d²/49