64a³+(2-a)³=(4a+(2-a))(16a²-4a(2-a)+(2-a)²)=(3a+2)(16a²-8a+4a²+4+a²-4a²)=(3a+2)(17a²-8a+4)
( X + 1 ) / ( Y + 1 ) = 1 / 2
( X - 1 ) / ( Y - 1 ) = 1 / 3
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X + 1 = ( Y + 1 ) / 2
X = [ ( Y + 1 ) / 2 ] - 1 = ( Y + 1 - 2 ) / 2 = ( Y - 1 ) / 2 = 0,5Y - 0,5
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( 0,5Y - 0,5 - 1 ) / ( Y - 1 ) = 1 / 3
( 0,5Y - 1,5 ) / ( Y - 1 ) = 1/3
3 * ( 0,5Y - 1,5 ) = Y - 1
1,5Y - 4,5 = Y - 1
1,5Y - Y = - 1 + 4,5
0,5Y = 3,5
Y = 7
X = 0,5 * 7 - 0,5 = 3,5 - 0,5 = 3
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Ответ дробь 3/7
<span>-2(х-3)=-3(х+7)
-2х+6=-3х-21
-2х+3х=-21-6
х=-27
Ответ:-27 </span>
Решение
<span>Log3 X +logx 3 =2
x > 0, x </span>≠ 1<span>
log</span>₃ x + log₃ 3/log₃ x = 2
log₃ ² - 2log₃x + 1 = 0
log₃x = z
z² - 2z + 1 = 0
(z - 1)² = 0
z = 1
<span>log₃x = 1
</span><span>x = 3</span>
Arcsin(0.3306)=21.45021898