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Логарифм x по основанию 2 плюс логарифм x по основанию 4 плюс логарифм x по основанию 16 равно 7 с объяснениями формула перехода

Алгебра

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akbmaslafarkop3175
Log₂x+log₄x+log₁₆x=7

log₄x=log(₂²) x=(1/2)*log₂x
log₁₆x=log(₂⁴) x=(1/4)*log₂x
log₂x+(1/2)*log₂x+(1/4)*log₂x=7
log₂x*(1+1/2+1/4)=7
log₂x *(7/4)=7
log₂x=7:(7/4)
log₂x=4
x=2⁴
x=16
nsoro937
А) х+2=4-х  б) 3х+1=5х-3   в)2х-3=2-3х     г)2х+3=3х-7   д)9х-2=5х-2
х+х=4-2         3х-5х=-3-1      2х+3х=2+3      2х-3х=-7-3      9х-5х=-2+2
2х=2              -2х=-4            5х=5                -х=-10            4х=0
х=1                  х=2               х=1                 х=10               х=0

е)10-3х=2х-15          ж)10х+7=8х-9       з)53-6х=4х-17        и)8+2х=16+х
   -3х-2х=-15-10           10х-8х=-9-7          -6х-4х=-17-53        2х-х=16-8
    -5х=-25                   -2х=-16                -10х=-70                х=8
      х=5                        х=8                      х=7
ЕленаАнастасия315

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