Question

1)1,8 −( −4,3) = (0,2 + 0,5) −1,6. 2)20( −1) −20 = 70.

Answer 1

Ответ:

1) 6,1 = -0,9

2) -40 = 70

Объяснение: Если перед скобкой стоит минус, значит меняем знак в скобке на противоположный или же минус на минус даёт плюс.

Answer 2

Let's solve the given expressions step by step:

1) $1.8 - (-4.3) = (0.2 + 0.5) - 1.6$

Left-hand side: $1.8 - (-4.3) = 1.8 + 4.3 = 6.1$

Right-hand side: $(0.2 + 0.5) - 1.6 = 0.7 - 1.6 = -0.9$

The left-hand side does not equal the right-hand side, so the given equation is not true.

2) $20(-1) - 20 = 70$

Left-hand side: $20(-1) - 20 = -20 - 20 = -40$

Right-hand side: $70$

The left-hand side does not equal the right-hand side, so the given equation is not true.

Therefore, both of the given equations are not true. If you have any further questions or if there is anything else I can help you with, feel free to ask!