Question

38+ (38+a: 3)-3 x 10 = 84​

Answer 1

Răspuns: $\bf \red{\underline{a =114}}$

Explicație pas cu pas:

Rezolvam prin metoda mersului invers

$\bf 38+ \big(38+a: 3\big)-3 \cdot 10 =84$

$\bf 38+ \big(38+a: 3\big)-30 =84$

$\bf \big(38+a: 3\big)-30 =84-38$

$\bf \big(38+a: 3\big)-30 =46$

$\bf \big(38+a: 3\big) =46+30$

$\bf \big(38+a: 3\big) =76$

$\bf 38+a: 3 =76 -38$

$\bf a: 3 =38~~~~~~\bigg|\cdot 3$

$\bf \red{\underline{a =114}}$

==pav38==

Baftă multă !

Answer 2

Răspuns:

Buna

38+ (38+a: 3)-3 x 10 = 84

$38 + (38 + \frac{1}{3} a) - 30 = 84$

$38 +38 + \frac{1}{3} a - 30 = 84$

$46 + \frac{1}{3} a = 84$

$138 + a = 252$

$a = 252 - 138$

$a = 114$