26-5х<2-3(x-6)
26-5x<2-3x+18
26-2-18<5x-3x
6<2x
2x>6
x>6/2
x>3
а = √S - формула
а = √900 = 30(см)
1) х = 125
2) х = -2
3) х = 1/6
4) x = -1
5) x = -2
6) x = 4
7) x = 0.2