Question

m) 7-[100x68:17-5x(60x6-2xa)]:20=2
URGENt

Answer 1

Răspuns: $\bf \pink{ \underline{a = 150}}$

Explicație pas cu pas:

Vom folosi metoda mersului invers pentru a rezolva exercițiul

$\bf 7- \big[100 \cdot 68:17-5 \cdot(60 \cdot6-2 \cdot a) \big]:20=2$

$\bf 7 = 2 + \big[100 \cdot 68:17-5 \cdot(60 \cdot6-2 \cdot a) \big]:20$

$\bf 7 - 2 = \big[100 \cdot 68:17-5 \cdot(60 \cdot6-2 \cdot a) \big]:20$

$\bf 5 = \big[100 \cdot 68:17-5 \cdot(60 \cdot6-2 \cdot a) \big]:20 \: \: \: \: \: \bigg| \cdot20$

$\bf 100 = 100 \cdot 68:17-5 \cdot(60 \cdot6-2 \cdot a)$

$\bf 100 = 6800:17-5 \cdot(60 \cdot6-2 \cdot a)$

$\bf 100 = 400-5 \cdot(60 \cdot6-2 \cdot a)$

$\bf 100 + 5 \cdot(60 \cdot6-2 \cdot a) = 400$

$\bf 5 \cdot(60 \cdot6-2 \cdot a) = 400 - 100$

$\bf 5 \cdot(60 \cdot6-2 \cdot a) = 300 \: \: \: \: \: \bigg| : 5$

$\bf (60 \cdot6-2 \cdot a) = 60$

$\bf 360-2 \cdot a = 60$

$\bf 360 =60 + 2 \cdot a$

$\bf 360 - 60 = 2 \cdot a$

$\bf 300 = 2 \cdot a$

$\bf a = 300 :2$

$\bf \pink{ \underline{a = 150}}$

==pav38==

Baftă multă !