\(A=0,36\times3649+0,9\times351\times0,4\)
\(=0,36\times3649+0,36\times351\)
\(=0,36\times\left(3649+351\right)\)
\(=0,36\times4000\)
\(=1440\)
\(\text{Ta có : }\)
\(A=0,36\text{ x }3649+0,9\text{ x }351\text{ x }0,4\)
\(A=0,36\text{ x }3649+\left(0,9\text{ x }0,4\right)\text{ x }351\)
\(A=0,36\text{ x }3649+0,36\text{ x }351\)
\(A=0,36\text{ x }\left(3649+351\right)\)
\(A=0,36\text{ x }4000\)
\(A=1140\)