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