1. ( 3,17+0,77: 1,4)*3,5-4,216= 2. 4-6(х+2)=3-5х 3. (5х++14)=9

 (5х+8)-(8х+14)=91. ( 3,17+0,77:1,4)*3,5-4,216=8.804
1) 0,77:1,4= 0.55         3)3.72*3.5= 13.02
2)3.17+0.55= 3.72       4) 13.02-4.216=8.804
2.4-6(х+2)=3-5х
4-6х+12=3-5х
-6х+5х=3-12
-х=-9
ответ:-х=-9 (5х+8)-(8х+14)=9
3.(5х+8)-(8х+14)=9
5х+8-8х-14=9
5х-8х=9-8+14
-3х=15    /:(-3)
х=-5
ответ:х=-5