Question

Determinați x din fiecare egalitate în parte:

a) x:0,25+1=2,5; b) 2,7·x-13,6:2=2,2; c) x:0,25+1,5=3; d) 2,7·x-13,6:2=2,2​

Answer 1

Răspuns:

a)

$\frac{x}{0.25} + 1 = 2.5$

$\frac{x}{0.25} = 2.5 - 1$

$\frac{x}{0.25} = \frac{1.5}{1}$

$x = 0.25 \times 1.5$

$x = 0.375$

b)

$2.7x - \frac{13.6}{2} = 2.2$

$2.7x = 2.2 + 6.8$

$2.7x = 9$

$x = \frac{9}{2.7}$

c)

$\frac{x}{0.25} + 1.5 = 3$

$\frac{x}{0.25} = 3 - 1.5$

$\frac{x}{0.25} = \frac{1.5}{1}$

$x = 0.25 \times 1.5$

$x = 0.375$

d)

are aceasi rezolvare ca b