Question

решите плиз! срочно!!

Answer 1

1) 0.15(х-9)+3,2(х-6,5)=0,12(х-31)-68,68-4,7(х-36)
0,15х-1,35+3,2х-20,8=0,12х-3,72-68,68-4,7х+169,2
0,15х+3,2х-0,12х+4,7х=1,35+20,8-3,72-68,68+169,2
7,93х=118,95
х=118,95/7,93
х=15
2) 4,5(10у-5^2*2)-3(3 2/3 y+10^3)=9(2 5/9 y+30)-(19y-75)
45y-225-11y-3000=23y+270-19y+75
45y-11y-23y+19y=225+3000+270+75
30y=3570
y=3570/30
y=119
3)37z-40-38z-5100=46z-90-12z+10-300
37z-38z-46z+12z=40+5100-90+10-300
-35z=4760
-z=4760/35
z=-136  ??????????????????????????????????

Answer 2

а 3