Răspuns:
[(a ÷ 2 - 75 ÷ 5) + 20 × 9 + 35] ÷ 10 = 40
[(a ÷ 2 - 15) + 180 + 35] ÷ 10 = 40
[tex] (\frac{1}{2} a - 15 + 180 + 35) \times \frac{1}{10} - 40[/tex]
[tex]( \frac{1}{2} a + 200) \times \frac{1}{10} - 40[/tex]
[tex] \frac{a + 400}{2} \times \frac{1}{10} - 40 [/tex]
[tex] \frac{a + 400 \times 1}{2 \times 10} - 40[/tex]
[tex] \frac{a + 400}{20} - 40[/tex]
a + 400 = 40 × 20
a + 400 = 800
a = 800 - 400
a = 400
Sper ca te-am ajutat!
