Question

[420 - 2 x 45: (37 - 7 x x)] : (4 x 4 - 1) = 25.​

Answer 1

Răspuns:

[420 - 2 x 45: (37 - 7x)] : (4 x 4 - 1) = 25

[420-90:(37-7x)]:15=25

420-90:(37-7x)=25·15

90:(37-7x)=420-375

37-7x=90:45

7x=37-2

x=35:7

x=5

Answer 2

Răspuns: $\bf \red{\underline{x=5}}$

Explicație pas cu pas:

$\bf [420 - 2 \cdot 45: (37 - 7x)] : (4 \cdot 4 - 1) = 25$

$\bf [420 -90: (37 - 7x)] : (16 - 1) = 25$

$\bf [420 -90: (37 - 7x)] : 15= 25$

$\bf [420 -90: (37 - 7x)] = 25\cdot 15$

$\bf 420 -90: (37 - 7x) = 375$

$\bf 420 =375+90: (37 - 7x)$

$\bf 420 -375=90: (37 - 7x)$

$\bf 45=90: (37 - 7x)$

$\bf 45\cdot (37 - 7x) =90~~~~\bigg|:45$

$\bf 37 - 7x=2$

$\bf 37 =2+7x$

$\bf 37 -2=7x$

$\bf 35=7x$

$\bf x = 35 : 7$

$\bf \red{\underline{x=5}}$

==pav38==