Tìm x a) 4, 5 x x = 11, 06 + 2,44 b) 9,9 : x = 6,4 – 5,08

* Hướng dẫn giải

a)

$\begin{array}{l}4,5\times x=11,06+2,44\\ 4,5\times x=13,5\\ x=13,5:4,5\\ x=3\end{array}$

b)

$\begin{array}{l}9,9:x=6,4-5,08\\ 9,9:x=1,32\\ x=9,9:1,32\\ x=7,5\end{array}$