Question

1 ) 2,8×(-3,9)-76,15÷23. 2)34,68÷(7,11+1,56)+46÷(2,45-1,65)

Answer 1

Ответ:

Объяснение:

1 ) 2,8×(-3,9)-76,15÷23= -10,92-3,31=-14,23

2)34,68÷(7,11+1,56)+46÷(2,45-1,65)= 34,68:8,67+46:0,8= 4+57,5=61,5

Answer 2

Sure, I can help you solve these mathematical expressions step by step:

1. $2.8 \times (-3.9) - \frac{76.15}{23}$

Step 1: Multiply 2.8 by -3.9 $2.8 \times (-3.9) = -10.92$

Step 2: Divide 76.15 by 23 $\frac{76.15}{23} \approx 3.3098$

Step 3: Subtract the result from step 2 from the result in step 1 $-10.92 - 3.3098 \approx -14.2298$

So, the result of the first expression is approximately -14.2298.

2. $34.68 \div (7.11 + 1.56) + \frac{46}{2.45 - 1.65}$

Step 1: Add 7.11 and 1.56 $7.11 + 1.56 = 8.67$

Step 2: Divide 34.68 by the result from step 1 $34.68 \div 8.67 \approx 3.9994$

Step 3: Subtract 1.65 from 2.45 $2.45 - 1.65 = 0.8$

Step 4: Divide 46 by the result from step 3 $\frac{46}{0.8} = 57.5$

Step 5: Add the results from step 2 and step 4 $3.9994 + 57.5 \approx 61.4994$

So, the result of the second expression is approximately 61.4994.