Question

Rút gọn: A=\(\frac{5+55+555+5555}{9+99+999+9999}\)

Answer 1

\(A=\frac{5+55+555+5555}{9+99+999+9999}=\frac{5.\left(1+11+111+1111\right)}{9.\left(1+11+111+1111\right)}=\frac{5}{9}\)

Answer 2

Tớ làm luôn

A=\(\frac{5.\left(1+11+111+1111\right)}{9.\left(1+11+111+1111\right)}\)

A=\(\frac{5}{9}\)

Answer 3

\(A=\frac{\left(5.1+5.11+5.111+5.1111\right)}{9.1+9.11+9.111+9.1111}\)

\(A=\frac{5.\left(1+11+111+1111\right)}{9.\left(1+11+111+1111\right)}\)

\(\Rightarrow A=\frac{5}{9}\)

Chúc em học tốt^^

Answer 4

\(A=\frac{5+55+555+5555}{9+99+999+9999}\)

\(A=\frac{5\cdot\left(1+11+111+1111\right)}{9\cdot\left(1+11+111+1111\right)}\)

\(A=\frac{5}{9}\)

OK

Answer 5

A=5/9

Answer 6

ĐÁP SỐ : 5/9