Question

- 0.4b + 0.8b - 0.2b + 0.4b = ? - (3x - 4) - 1 = ? 2 + (- 6 - x ) = ? - 6 (2 - 3y ) + 3 (4 - 5y) = ? (-x + 2) × (-7) - (4 - 7x) = ? Решить уравнение : -2 (4x - 3 + 3 ( 3x - 6) = 0

Answer 1

0.6b
-3x+3
-4-x
3y
14x-18

-2(4x-3+9x-18)=0
-8x+6-18x+36=0
-26x+42=0
-26x=-42
x=1.5

Answer 2

Let's solve each problem step by step:

1. 0.4b + 0.8b - 0.2b + 0.4b = ? Combining like terms, we get: = (0.4 + 0.8 - 0.2 + 0.4) b = 1.4b

Therefore, 0.4b + 0.8b - 0.2b + 0.4b = 1.4b.

2. -(3x - 4) - 1 = ? Distributing the negative sign, we get: = -3x + 4 - 1 - 1 = -3x + 2

Therefore, -(3x - 4) - 1 = -3x + 2.

3. 2 + (-6 - x) = ? Combining like terms, we get: = 2 - 6 - x = -4 - x

Therefore, 2 + (-6 - x) = -4 - x.

4. -6(2 - 3y) + 3(4 - 5y) = ? Distributing the multiplication, we get: = -12 + 18y + 12 - 15y = 3y

Therefore, -6(2 - 3y) + 3(4 - 5y) = 3y.

5. (-x + 2) × (-7) - (4 - 7x) = ? Distributing the multiplication and simplifying, we get: = 7x - 14 - 4 + 7x = 14x - 18

Therefore, (-x + 2) × (-7) - (4 - 7x) = 14x - 18.

6. -2(4x - 3 + 3(3x - 6)) = 0 Distributing the multiplication and simplifying, we get: = -8x + 6 - 18x + 36 = -26x + 42

Therefore, -2(4x - 3 + 3(3x - 6)) = -26x + 42.

So the solution to the equation is -26x + 42 = 0, which can be solved as follows: -26x + 42 = 0 -26x = -42 x = 42/26 x = 21/13

Therefore, the solution to the equation -2(4x - 3 + 3(3x - 6)) = 0 is x = 21/13.