Question

1,2(x-7)-1,6(8-x) если х=4,2

Answer 1

1,2(х-7)-1,6(8-х)=1,2х-8,4-12,8+1,6х= 2,8х-21,2
если х=4,2
2,8х-21,2=2,8•4,2-21,2= 11,76-21,= -9,44