3 ^ ( x - 1 ) ≥ 27√3
3 ^ ( x - 1 ) ≥ 3³ * 3 ^ 1/2
3 ^ ( x - 1 ) ≥ 3 ^ 3,5
x - 1 ≥ 3,5
x ≥ 4,5
[ 4,5 ; + ∞ )
1) 15/4 : 3/100 = 15/4 * 100/3 = 125
2) 4 52/100 : (-4 5/27) = 452/100 : (-113/27) = 452/100 * (-27/113)= -1.08
3)125 + (-1.08)= 125 - 1.08 = 123.92
-1-5/9а=-9а-5
-9×(-0,45)-5=4,5-5=-0,5
-9×(-1)=9-5=4
-9×3/5-5=-9/1×3/5-5=-27/5-5=-5целых 2/5-5= -10целых2/5
19х-15х=96
4х=96
х=24
5б+3б=456
8б=456
б=57