A) 3 * x * 3 = 3,45
= 9 * x = 3,45
=> x = \(\frac{3,45}{9}\)
b) 84 * x * 0,25 = 1,05
= 21 * x = 1,05
=> x= 1,05 : 21 = 0,05
\(a,3\times x\times3=3,45\)
\(3\times x=3,45:3\)
\(3\times x=1,15\)
\(x=1,15:3\)
\(x=\frac{1,15}{3}\)
\(b,84\times x\times0,25=1,05\)
\(84\times x=1,05:0,25\)
\(84\times x=4,2\)
\(x=4,2:84\)
\(x=0,05\)