3×+5×+3×56×= 12×21×35+34×= 12%+13%+35%= 241%+362%= - id2101544120200101 от maevava 01.01.2020 20:27

Question

Алгебра: 3×+5×+3×56×= 12×21×35+34×= 12%+13%+35%= 241%+362%=

maevava · Accepted Answer

1
log(2)(2x-1)-2=log(2)(x+2)-log(2)(x+1)
{2x-1>0⇒2x>1⇒x>0,5
{x+2>0⇒x>-2
{x+1>0⇒x>-1
x∈(0,5;∞)
log(2)[(2x-1)/4]=log(2)[(x+2)/(x+1)]
(2x-1)/4=(x+2)/(x+1)
(2x-1)(x+2)=4(x+1)
2x²+4x-x-2-4x-4=0
2x²-x-6=0
D=1+48=49
x1=(1-7)/4=-1,5 не удов усл
x2=(1+7)/4=2
2
{x-2>0⇒x>2
{x-8>0⇒x>8
{log(4)[(x-2)(x-8)]<2⇒(x-2)(x-8)<16
x²-8x-2x+16-16<0
x²-10x<0
x(x-10)<0
x=0 x=10

      + _ +
(0)(2)(8)(10)


x∈(8;10)

3×+5×+3×56×=12×21×35+34×=12%+13%+35%=241%+362%=

MOGZ ответил

3×+5×+3×56×=
12×21×35+34×=

12%+13%+35%=
241%+362%=