Question

Вычисли значение алгебраического выражения 6a+7b:3a−4b, если a=1,2, b=5,4

Answer 1

$\frac{(6a + 7b)}{3a - 4b} \\ \frac{6 \times 1.2 + 7 \times 5.4}{3 \times 1.2 - 4 \times 5.4} = \frac{45}{ - 18} = - \frac{5}{2}$

Answer 2

To find the value of the algebraic expression $6a + \frac{7b}{3a} - 4b$, we can simply substitute the given values of $a$ and $b$ and then perform the arithmetic operations.

Given: $a = 1.2$ (Note: the decimal comma is used instead of the decimal point in some regions) $b = 5.4$

Now, let's substitute these values into the expression and calculate:

$6 \cdot 1.2 + \frac{7 \cdot 5.4}{3 \cdot 1.2} - 4 \cdot 5.4$

$= 7.2 + \frac{37.8}{3.6} - 21.6$

Now, let's calculate $\frac{37.8}{3.6}$:

$= 7.2 + 10.5 - 21.6$

Now, let's add the numbers together:

$= 7.2 + 10.5 - 21.6$

$= -4.9$

So, the value of the algebraic expression with $a = 1.2$ and $b = 5.4$ is $-4.9$.