x+y=0

=>P=1

tong van toc 2 xe la :

162:2=81[km/gio]

van toc cua o to di tu A la:

81:[4+5]x4=36[km/gio]

van toc cua o to di tu B la:

81-36=45[km/gio]

diem gap nhau cach A la :

36x2=72[km]

ma minh noi may ban co ranh khong ma tan bam cai gi khong vay co moi tay khong sao ma nhieu chu the lam minh muon chong mat luon day

=29.87-23+71

=29.(87+23)-71

=29.110-71

=29.39

=1131

k cho minh nhe bạn