1)
5^(x+1)+5^(x)=5³*6
6*5³=6*5^(x)
x=3
2)
5^x>5⁴
x>4
x∈(4;∞)
3)
5^(x+2)=125
5^(x+2)=5³
x+2=3
x=1
5-11х= -2x²
2x²-11x+5=0
D=121-40=81
x<span>1=11-9/10=2/10=0.2
x2=11+9/10=20/10=2
</span>9x²<span>-24х= -16
</span>9x²-24x+16=0
k=12
D=144-144=0;D=0
x=24:18=4/3
6x²<span>-4=0
</span>6x²=4
x²=2/3
x=+-√2/3