Question

Решите примеры. (-30)×(-25)=16.2×5=9.3×0.45=28:(-4)=2.4:0.3=4-6=-140-1000=6-0.45=(-2+x) (x+2)=(-4)3=k (a+b)=

Answer 1

Вот всё всё решено!!!

Answer 2

Let's solve each of the given mathematical expressions step by step:

1. (-30) × (-25): When you multiply two negative numbers, the result is positive. (-30) × (-25) = 30 × 25 = 750

2. 16.2 × 5: 16.2 × 5 = 81

3. 9.3 × 0.45: 9.3 × 0.45 = 4.185

4. 28 : (-4): When dividing by a negative number, the result is negative. 28 : (-4) = -7

5. 2.4 : 0.3: 2.4 : 0.3 = 8

6. 4 - 6: 4 - 6 = -2

7. -140 - 1000: -140 - 1000 = -1140

8. 6 - 0.45: 6 - 0.45 = 5.55

9. (-2 + x)(x + 2) = -4: This is a quadratic equation, let's solve it step by step. Expand the left side: x^2 + 2x - 2x - 4 = x^2 - 4 = -4 Now, move -4 to the other side: x^2 = 0 Take the square root of both sides: x = 0

10. (a + b) = k: This equation cannot be solved without more information. It represents an equation with two variables (a and b) and a constant (k), so there are multiple possible solutions depending on the values of a, b, and k.

If you have specific values for a, b, and k, I can help you find the solutions. Otherwise, this equation cannot be further simplified without additional information.