x:(0,2+0,25)=4,05
X:0,45=4,05
x=4,05:0,45=9
\(\Leftrightarrow x:\left(0,2+0,25\right)=4,05\)
\(\Leftrightarrow x:0,45=4,05\)
\(\Leftrightarrow x=4,05\div0,45\)
\(\Rightarrow x=9\)
X : 0,2 + X : 0,25 = 4,05
X x 5 +X x 4=4,05
X x (5+4)=4,05
X x 9 =4,05
X =4,05 : 9
X =0,45
=>\(x\)x5+\(x\)x4=4,05
=>\(x\)x(5+4)=4,05
=>\(x\)x9=4,05
=> x =4.05:9
=> x = 0,45