7.° Розкладіть на множники: 1) 16-6²; 5) 4x² -25; 2) c² -49; 3) 0,04-a²; 6) 81c² −64d2; 7) 0,09x² -0,25у2; 9) 4a²c² -9x²y2; 10) x24 - y22; 11) -1600+a¹²;​
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