6-х=0
Х=6
(3х+9)3=0
3х+9=0
Х=-3
Ответ:(- бесконечность,-3) и (6,+бесконечность)
1)=0,7-(-5/2)+2=0,7+2,5+2=5,2
=3*(6+2√3)+3*(6-2√3)/(6+2√3)(6-2√3)=(18+6√3+18-6√3)/6²-(2√3)²=36/36-12=36/24=
3/2=1,5
Sin57cos27+cos57sin27= sin(57 + 27) = sin(84) ≈ 0.99
sin57cos27-cos57sin27= sin(57 - 27) = sin(30) = 1/2
2sin 75*cos75= sin2*75 = sin150 = sin(180 - 30) = sin30 = 1/2
2sin 75 - cos75 = 2si + 45) – cos(30 + 45) = 2sin30cos45 + 2cos30sin45 – cos30cos45 + sin30sin45 = 2*(1/2)*(√2/2) + 2*(√3/2)*(√2/2) - (√3/2)*(√2/2) + (1/2)* (√2/2) = 3√2/4<span> - √6/4</span>
Система уравнений
3(5x+3y)-6=2x+11
<span>4x-15=11-2(4x-y)</span>
Решениееее....................