-0,5(7b-12a) - (8.4a - 14b)= при а = - 10, b = - 6
=-3,5b+6a-8,4a+14b=
=-11,9b+20b
-11,9* (-6)+20*(-10)=
=71.4-200=
=-128.6
2) 2/5
3) 36/100 - (6/75 -4/75) = 36/100- 2/75= 270/750 - 20/750= 250/750
1) х+9,34=12
х=12-9,34
х=2,66
2) 5/12-у=0,15
у=5/12-3/20=25/60-9/60
у=4/15
3)Я шяс делаю