Question

a x 2 + a : 2 = 5 , tìm a và 2,25 - ( 5 x a - 125 : 5 ) = 0 . Gíup t vs . Mơn nhìuuu ặ :)

Answer 1

\(a\times2+a:2=5\)

\(a\times2+a\times\dfrac{1}{2}=5\)

\(a\times\left(2+\dfrac{1}{2}\right)=5\)

\(a\times\dfrac{5}{2}=5\)

\(a=5:\dfrac{5}{2}\)

\(a=2\)

Vậy \(a=2\)

\(2,25-\left(5\times a-125:5\right)=0\)

\(2,25-5\times a+25=0\)

\(27,25-5\times a=0\)

\(5\times a=27,25\)

\(a=27,25:5\)

\(a=5,45\)

Vậy a=5,45