Question

Tìm X : x : 2 + x*3 =12

B) x*7 - x *3 = 123

Answer 1

b)\(7\times x-3\times x=123\)

\(x\times\left(7-3\right)=123\)

\(x\times4=123\)

\(x=123\div4\)

\(x=30,75\)

Answer 2

Ta có: \(\frac{x}{2}+3\times x=12\)

\(x\times\frac{1}{2}+3\times x=12\)

\(x\times\left(\frac{1}{2}+3\right)=12\)

\(x\times\frac{7}{2}=12\)

\(x=12\div\frac{7}{2}\)

\(x=\frac{24}{7}\)

Answer 3

3.428571429

30,75