Question

6а + 7b ———— 3a — 4b. Если а = 1,2, b =5,4

Answer 1

$\frac{6 \times 1.2 + 7 \times 5.4}{3 \times 1.2 - 4 \times 5.4} = \frac{7.2 + 37.8}{3.6 - 21.6} = \\ \\ = \frac{45}{ - 18} = - 2.5$

Ответ: -2.5

Answer 2

6•1,2+7•5,4 7,2+37,8
__________ = _________
3•1,2-4•5,4 3,6-21,6

= -45/18= -5/2= -2,5

Answer 3

To find the value of the expression 6а + 7b ———— 3a — 4b when а = 1.2 and b = 5.4, you simply need to substitute the values of a and b into the expression and perform the calculations step by step.

Let's calculate it:

1. Substitute the values of a and b into the expression: 6 * 1.2 + 7 * 5.4 ———— 3 * 1.2 — 4 * 5.4

2. Perform the calculations: 7.2 + 36.6 ———— 3.6 — 21.6

3. Continue the calculations: (7.2 + 36.6) — 3.6 — 21.6

4. More calculations: 43.8 — 3.6 — 21.6

5. Final result: 43.8 — 25.2

6. Final calculation: 18.6

So, when a = 1.2 and b = 5.4, the expression 6а + 7b ———— 3a — 4b evaluates to 18.6.