<span>4a+9b=40
a= (40 - 9b)/ 4</span>
3пи/4 + пи*n <х< пи + пи*n
<span>log4(7-x)^2 + log4(x+9)^2=4+log4(x+9)^2
</span><span>log4(7-x)^2 + log4(x+9)^2=log4 256+log4(x+9)^2
</span>2log4 (7-x) + 2log4 (x+9) = 2log4 16 + 2log4 (x+9) |:2
log4 (7-x)(x+9) = log4 16(x+9)
<span>(7-x)(x+9) = 16(x+9)
</span><span>(7-x)(x+9) - 16(x+9) = 0
</span>(x + 9) (7 - x - 16) = 0
x + 9 = 0 или - 9 - x = 0
x = -9 x = -9
Ответ -9
1,8d^5+0,9d^3-5,4d скачай на телефон фотоматч
<span>a₁ = 2, </span>
<span>a₆ = a₁q⁵ = −18√3, </span>
<span>q⁵ = a₆/a₂ = −9√3 = (−√3)⁵, </span>
<span>q = −√3. </span>
<span>Вставлять надо числа −2√3, 6, −6√3, 18.</span>
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