Question

15) 0,8 . (64,3 - 67,2 : 4,2) + 13,6; 16) 84,2 : 0,4 - (36,5 0,4 +8,8): 0,5.​

Answer 1

Ответ:

15) 0,8 * (64,3 - 67,2 : 4,2) + 13,6=0,8*48,3+13,6=52,24

16) 84,2 : 0,4 - (36,5 *0,4 +8,8): 0,5.= 210,5-23,4:0,5=210,5-46,8=163.7

Пошаговое объяснение:

Answer 2

Let's solve these mathematical expressions step by step:

15. $0.8 \cdot \left(64.3 - \frac{67.2}{4.2}\right) + 13.6$

First, calculate the expression inside the parentheses:

$$64.3 - \frac{67.2}{4.2} = 64.3 - 16 = 48.3$$

Now, multiply this result by 0.8:

$$0.8 \cdot 48.3 = 38.64$$

Finally, add 13.6 to the previous result:

$$38.64 + 13.6 = 52.24$$

So, the answer to the first expression is 52.24.

16. $84.2 \div 0.4 - \left(36.5 \cdot 0.4 + 8.8\right) \div 0.5$

First, calculate the expression inside the parentheses:

$$36.5 \cdot 0.4 = 14.6$$

Now, calculate the expression inside the brackets:

$$14.6 + 8.8 = 23.4$$

Now, divide this result by 0.5:

$$\frac{23.4}{0.5} = 46.8$$

Finally, divide 84.2 by 0.4 and subtract the result from the previous step:

$$\frac{84.2}{0.4} - 46.8 = 210.5 - 46.8 = 163.7$$

So, the answer to the second expression is 163.7.