1) f(x)=√(4-8x)
ООФ: 4-8x≥0, 8x≤4, x≤1/2, x∈(-∞,1/2]
2)f(x)=6/(12x-3)
ООФ: 12x-3≠0, 12x≠3, x≠1/4, x∈(-∞,1/4)∨(1/4,∞)
А²-8а+16+а²-16+8а=2а²=2×(-0,2)²=0,08
3а+6b=3(a+2b)
2c²-8c∧5=2c²(1-4c³)
1/9n²-n∧4=n²(1/9-n²)
81-18k+k²=(k-9)²
z³-z²+2z-2-z³-2z=-z²-2
-z²-2≠0
1)
a) 9
б) 0,75
5)
а) \/26<\/62
б) \/234 < 16
5ctg 1140°-2cos 750°=
=5ctg (6*180°+60°) -2cos (2*360°+30°)=
=5ctg 60°-2cos 30°=
=5*✓3/3-2*✓3/2=
=5✓3/3 - ✓3= 2✓3 / 3