Question

-0,6(1,6a -5) -(2,9b-8) -4(4-1,5b) при а=2.7 b=-9/13

Answer 1

Ответ:

$-0,6(1,6a -5) -(2,9b-8) -4(4-1,5b)=\\=-0,96a+3-2,9b+8-16+6b=\\=-0,96a-5+3,1b\\a=2,7 ;b=-\frac{9}{13} \\-0,96*2,7-5+3,1*(-\frac{9}{13})=-2,592-5+\frac{31}{10}* (-\frac{9}{13})=\\=-7,592-\frac{279}{130}=-7,592-2,14615=-9,73815 =-9,74$

Answer 2

To solve the expression $-0.6(1.6a - 5) - (2.9b - 8) - 4(4 - 1.5b)$ with $a = 2.7$ and $b = -\frac{9}{13}$, we'll substitute the values of $a$ and $b$ into the expression and calculate it step by step:

1. Substitute $a = 2.7$ and $b = -\frac{9}{13}$:

$-0.6(1.6 \cdot 2.7 - 5) - (2.9 \cdot \left(-\frac{9}{13}\right) - 8) - 4(4 - 1.5 \cdot \left(-\frac{9}{13}\right))$

2. Calculate the values inside the parentheses and brackets:

$-0.6(0.8) - (2.9 \cdot \left(-\frac{9}{13}\right) - 8) - 4(4 + \frac{13.5}{13})$

$-0.48 + \left(\frac{26.1}{13} - 8\right) - 4(4 + 1.0385)$

$-0.48 + \left(2 - 8\right) - 4 \cdot 5.0385$

$-0.48 - 6 - 20.154$

3. Perform the remaining operations:

$-6.48 - 20.154$

$-26.634$

So, with $a = 2.7$ and $b = -\frac{9}{13}$, the value of the expression is approximately $-26.634$.