Question

решите уравнение (4,9+3,1 x)(7x*2,8)=0

Answer 1

4,9+3,1x=0, х1=-4,9/3,1=-1 18/31. 7x*2,8=0, х2=0

Answer 2

$(4.9+3.1x)(7x*2.8)=0 \ 4.9+3.1x=0 \ 3.1x=-4.9 \ x=- frac{4.9}{3.1} \ x=- frac{49}{31} \ x=-1 frac{18}{31} \ 7x*2.8=0 \ 19.6x=0 \ x=0$