Question

помогите, 1, 2, 3
дам 15 баллов + "спасибо" :33

Answer 1

1) (х-2)*30=13*10
30х-60=130
30х=130+60
30х=190
х=190/30=19/3=6.1/3

2) (2t+1)*27=8*54
54t+27=432
54t=432-27=405
t=405:54=7.27/54=7.1/2=7,5

3) 117*17=68*(4z-1,5)
272z-102=1989
272z=1989-102=1887
z=1887/272=6.255/272