a) 7x-5 ≤2x+60/-2x
7x-2x-5≤60
5x-5≤60
x≤60
x={0,1,2,3,......,60}
b) ?
c)12x+9≤4(3x+2)/-3x+2
12x+9-3x+2≤4
9x+9+2≤4
9x+11≤4
20x≤4 /:20
x≤0,2
x={0,1;0,2}
d)x+9x<73+37
10x<110 /:10
x<11
x={0,1,2,3,....,10}
e)2·[10+7·(82-9²)]+x<2011
2·[10+7·1]+x<2011
2·17+x<2011
34+x<2011
?
f)?
