1)
a) (1-a)² = 1-2a+a²б) (9c+x)² = 81c²+18cx+x²в) (3a-5b)² = 9a²-30ab+25b²г) (8+4x)² = 64+64x+16x²д) (2x-5c)² = 4x²-20xc+25c²е) 99² = (100-1)² = 10000-200+1 = 98012)
а) x²-8x+16 = (x-4)² = (x-4)(x-4)б) 4a²+4ab+b² = (2a+b)² = (2a+b)(2a+b)в) 1/36m²-3mn+81n² = (1/6m-9n)² = (1/6m-9n)(1/6m-9n)г) 0,25p²+0,6pq+0,36q² = (0,5p+0,6q)² = (0,5p+0,6q)(0,5p+0,6q)
