Question

Tìm x, biết :

a) 3 ×x ×5 = 3,45

b) x ×9,9 + x : 10 = 20,06

Answer 1

a) \(3\times x\times5=3,45\)
\(\Rightarrow\left(3\times5\right)\times x=3,45\)
\(\Rightarrow15\times x=3,45\)
\(\Rightarrow x=3,45:15\)
\(\Rightarrow x=0,23\)

Answer 2

\(a,3\times x\times5=3,45\\ 15\times x=3,45\\ x=0,23\)

Answer 3