Question

[Nguyen thi bích ngọc]

a) 96-3.(x+1)=42          b) (x-37):12=9

c)125:(x-3)=5

Mn bày e gấp

Answer 1

[Trên con đường thành công không có....]

Answer 2

[Kirito-Kun]

a. 96 - 3(x + 1) = 42

<=> 96 - 3x - 3 = 42

<=> 96 - 3 - 42 = 3x

<=> 3x = 51

<=> x = 17

b. (x - 37) : 12 = 9

<=> \(\dfrac{x}{12}-\dfrac{37}{12}=9\)

<=> \(\dfrac{x}{12}-\dfrac{37}{12}=\dfrac{108}{12}\)

<=> x - 37 = 108

<=> x = 108 + 37

<=> x = 145

c. 125 : (x - 3) = 5

<=> \(\dfrac{125}{x}-\dfrac{125}{3}=5\)

<=> \(\dfrac{375}{3x}-\dfrac{125x}{3x}=\dfrac{625x}{3x}\)

<=> 375 - 125x = 625x

<=> 375 = 625x + 125x

<=> 500x = 375

<=> x = \(\dfrac{375}{500}=\dfrac{3}{4}\)