Question

Помогите пожалуйста 3 и 4

Answer 1

(4*0,3)*(0,5*40)=1,2*20=24

Answer 2

3.2*0.2+2.8*0.2+3.1=4.3

Answer 3

1)4.08-2.4=х+0.98

Answer 4

1.68=......,х=1.68-0,98