1) ......=0,2-3-х+2-0,4х+1=0,2 - 1,4х
2) .........=4х+4у+10х-5у=14х+у
3) .......= - 1/9 m - 1/3n - 3/4 m - 1= - 4/36 m - 27/36 m - 1/3 n -1= - 31/36 m - 1/3n - 1
4) ........=1 1/5 - 4 2/5 а - 1 1/5= - 4 2/5 а
5) ........= - 9 1/2 с - 1+9 1/2 с= - 1
6)
.........=10,5 - 14b+8b=10.5 - 6b
при b=1,3
105, - 6*1,3=10,5-7,8=2,7
7)
.........=2d-1.6-3.4+0.6d=2.6d-5
при d=5
2,6*5-5=8