7. Вычислите, используя формулу а²-b² = (a - b) (a + b). 1) 14²-112 5) 76²-24² 2) 20² - 19² 6) 128²-1722 3) 51²-41² 7) 2,5²-2,4² 121 4) 54²-45² 8) 1,1¹-12 помогите пожалуйста умаляю плис ​
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