Question

 4 : (x + 9) - 5 = 55 giải dùm mình với

Answer 1

\(\Rightarrow4:\left(x+9\right)=60\\ \Rightarrow x+9=\dfrac{4}{60}=\dfrac{1}{15}\Rightarrow x=\dfrac{1}{15}-9=-\dfrac{134}{15}\)

Answer 2

4:(x + 9) - 5 = 55

<=> 4:(x + 9) = 60

<=> x + 9 = 15

<=> x = 15 - 9

<=> x = 6

Answer 3

\(4:\left(x+9\right)-5=55\)

\(\Leftrightarrow4:\left(x+9\right)=55+5\)

\(\Leftrightarrow4:\left(x+9\right)=60\)

\(\Leftrightarrow x+9=4:60\)

\(\Leftrightarrow x+9=\dfrac{1}{15}\)

\(\Leftrightarrow x=\dfrac{1}{15}-9\)

\(\Leftrightarrow x=-\dfrac{134}{15}\)

Answer 4

4÷(x+9)-5=55

=)) 4÷(x+9)= 55+5

=)) 4÷(x+9)= 60

=)) x+9=60÷4

=))x+9=15

=))x= 15-9

=))x = 6