Question

0,5a+2,1b когда a=30 b=21​

Answer 1

0.5 * 30 + 2.1 * 21

15+44,1 = 59.1

Answer 2

$0,5a+2,1b;a=30,b=21 \Longrightarrow0,5*30+2,1*21=15+44,1=59,1.$

$Otvet:59,1.$