1) 1/9 y²-16/25x² = (1/3у + 4/5х)(1/3у - 4/5х)
2) 4/9a²-1/16b² = (2/3a + 1/4b)(2/3a - 1/4b)
3) 0,25a²-49b² = (0,5a + 7b)(0,5a - 7b)
4) 0,09x²-16y² = (0,3x + 4y)(0,3x - 4y)
1) 1/9 y²-16/25x² = (1/3у + 4/5х)(1/3у - 4/5х)
2) 4/9a²-1/16b² = (2/3a + 1/4b)(2/3a - 1/4b)
3) 0,25a²-49b² = (0,5a + 7b)(0,5a - 7b)
4) 0,09x²-16y² = (0,3x + 4y)(0,3x - 4y)