Question

1) 34,4 - (18,1-5,6)+(-11,9+8) = 2) 4х-6х-3х+7+х = 3) -8 * (х-3)+4 * (х-2)-2 * (3х+1) = 4) 2|7 * (14a 7|2b) - 1,2 * (5|6a - 0,5b) = Решите уравнение : (0,8 - 4х)(5х + 5,5)= 0

Answer 1

Первые три вот здесь с подробным решением

Answer 2

1. 34,4 - (18,1-5,6)+(-11,9+8) = = 34,4 - 12,5 + (-3,1) = 18,8

2. 4х-6х-3х+7+х = = -4х + 7

3. -8 * (х-3)+4 * (х-2)-2 * (3х+1) = = -8х + 24 + 4х - 8 - 6х - 2 = -10х + 14

4. 2|7 * (14a 7|2b) - 1,2 * (5|6a - 0,5b) = = 28a + 14b - 6a + 0.6b = 22a + 14.6b

To solve the equation (0,8 - 4х)(5х + 5,5)= 0, we need to use the zero product property, which states that if the product of two factors is equal to zero, then at least one of the factors must be equal to zero.

So we have two factors: (0,8 - 4х) = 0 or (5х + 5,5) = 0

Solving for the first factor, we get: 0,8 - 4х = 0 -4х = -0,8 х = 0,2

Solving for the second factor, we get: 5х + 5,5 = 0 5х = -5,5 х = -1,1

Therefore, the solutions to the equation are х = 0,2 and х = -1,1.