a)-7,-6,-5,-4,-3,-2,-1,0,1,2
б)1,2
в)-7,-6,-5,-4,-3,-2,-1
5х=-7.4+1.2
5х=-6.2
х=-6.2/5
х=-1.24
Ответ:100см=а^2+в^2
a+в=28/2=14
a=6см
в=8см