Question

21/17,5*0,8= 42/(5корень21)2= Уровненные -1/5х2+45=0

Answer 1

Вот ответ. третье не решено, сори...

Answer 2

Let's break down the calculations step by step:

1. 21 divided by 17.5 multiplied by 0.8: 21/17.5 * 0.8 = 0.96

2. 42 divided by the square root of 21, whole thing squared: 42 / (sqrt(21))^2 = 42 / (sqrt(21))^2 = 42 / (sqrt(21) * sqrt(21)) = 42 / 21 = 2

3. Solving the equation -1/5x^2 + 45 = 0 for x: To solve the quadratic equation, we can rewrite it as: -1/5x^2 + 45 = 0 Multiply both sides of the equation by -5 to eliminate the fraction: x^2 - 225 = 0 Add 225 to both sides: x^2 = 225 Take the square root of both sides (considering both positive and negative roots): x = ±15

Therefore, the solutions to the equation -1/5x^2 + 45 = 0 are x = 15 and x = -15.