?..............4^11×4^-9=4^2
Можно применить формулу разность квадратов: a²-b²=(a-b)(a+b).
7,352²+52,96-2,648²=(7,352²-2,648²)+52,96=
=(7,352-2,648)(7,352+2,648)+52,96=4,704*10+52,96=47,04+52,96=100.
![1)\; \; b>4\, :\; \; (b-3)>4-3\; \; \Rightarrow \; \; (b-3)>1\; \; \Rightarrow \; \; (a-3)>(b-3)>1\; ,\\\\(a-3)>0](https://tex.z-dn.net/?f=1%29%5C%3B+%5C%3B+b%3E4%5C%2C+%3A%5C%3B+%5C%3B+%28b-3%29%3E4-3%5C%3B+%5C%3B+%5CRightarrow+%5C%3B+%5C%3B+%28b-3%29%3E1%5C%3B+%5C%3B+%5CRightarrow+%5C%3B+%5C%3B+%28a-3%29%3E%28b-3%29%3E1%5C%3B+%2C%5C%5C%5C%5C%28a-3%29%3E0)
(a-3) - положительно (знак + )
![2)\; \; b>1\, :\; \; 7b>7\; \; \Rightarrow \; \; 7a>7b>7\; \; \Rightarrow \; \; \; 7a>0](https://tex.z-dn.net/?f=2%29%5C%3B+%5C%3B+b%3E1%5C%2C+%3A%5C%3B+%5C%3B+7b%3E7%5C%3B+%5C%3B+%5CRightarrow+%5C%3B+%5C%3B+7a%3E7b%3E7%5C%3B+%5C%3B+%5CRightarrow+%5C%3B+%5C%3B+%5C%3B+7a%3E0)
7a - положительно (знак + )
Вот тебе решение этого уравнения
Решение на фото)))))))))))))))))))))))