Question

1)0,7*(2,8-7,4)2)14/25:7/45-3​

Answer 1

Ответ:

1)0,7(2,8-7,4)=0,7(-4,6)=-3,22

2)14/25:7/45-3=14/25*45/7-3=2/5*9-3=18/5-3=(18-15)/5=3/5=0,6

Answer 2

Let's solve each of these mathematical expressions step by step:

1. $0.7 \cdot (2.8 - 7.4)$

First, calculate the expression inside the parentheses:

$2.8 - 7.4 = -4.6$

Now, multiply this result by 0.7:

$0.7 \cdot (-4.6) = -3.22$

So, the answer to the first expression is -3.22.

2. $14/25 : 7/45 - 3$

First, calculate the division:

$\frac{14}{25} : \frac{7}{45}$

To divide by a fraction, you can multiply by its reciprocal (flip it):

$\frac{14}{25} \cdot \frac{45}{7} = \frac{14 \cdot 45}{25 \cdot 7} = \frac{630}{175} = 3.6$

Now, subtract 3 from this result:

$3.6 - 3 = 0.6$

So, the answer to the second expression is 0.6.