Question

tìm a biết: A x 50% + A x 1/5 + A + 98 = 103

Answer 1

A x 50% + A x 1/5 + A + 98 = 103

=> \(A\times\frac{1}{2}+A\times\frac{1}{5}+A+98=103\)

=> \(A\times\left(\frac{1}{2}+\frac{1}{5}+1\right)+98=103\)

=> \(A\times\frac{17}{10}=103-98=5\)

=> \(A=5:\frac{17}{10}=5\cdot\frac{10}{17}=\frac{50}{17}\)

Answer 2

A x 50% + A x \(\dfrac{1}{5}\) + A + 98 = 103
A x \(\dfrac{50}{100}\) + A x \(\dfrac{1}{5}\) + A + 98 = 103
A x   \(\dfrac{1}{2}\)   + A x \(\dfrac{1}{5}\) + A + 98 = 103
A x (\(\dfrac{1}{2}\) + \(\dfrac{1}{5}\) + 1)      +    98 =103
A     x      \(\dfrac{17}{10}\)           +    98 = 103
A     x      \(\dfrac{17}{10}\)                      = 103 - 98
A     x      \(\dfrac{17}{10}\)                      = 5

A                                        = 5 x \(\dfrac{10}{17}\) = \(\dfrac{50}{17}\)