Question

Cine ma poate ajuta?
2x+1 supra 5= 7 supra 8

4 supra 5= 3x+2 supra 12,5

Answer 1

Răspuns

Explicație pas cu pas:

$\frac{2x+1}{5}=\frac{7}{8}  =>2x+1 = \frac{7*5}{8}\\2x+1 = \frac{35}{8} => 2x = \frac{35}{8}-1 = \frac{27}{8}   \\x = \frac{27}{8}:2 = \frac{27}{8}*\frac{1}{2}= \frac{27}{16}$

Answer 2

$a)\frac{2x + 1}{5} = \frac{7}{8} = > (2x + 1)8 = 7 \times 5 = > 16x + 8 = 35 = > 16x = 27 = > x = \frac{27}{16}$
$b) \frac{4}{5} = \frac{3x + 2}{12.5} = 4 \times 12.5 = 5(3x + 2) = > 50 = 15x + 10 = > - 15x = - 40 = > x = \frac{40}{15} = > x = \frac{8}{3}$