(-3.25-2.75)÷(-0.6)+0.8×(-7)= (-6)÷(- 0.6)+0.8×(-7)= 10+0.8×(-7)= 10+(-5,6)= 10-5.6= 4.4
-3<-1
-8<-6
Умножаем: (-3)*(-8) и (-1)*(-6).
24>6
ODЗ: 2х-1>0 2x>1 x>1/2
Log7 (2x-1)<Log7 7²
2x-1<49 2x<50 x<25
-////////////////1/2////\\\\\\\\\\\\\\\\\\\\\\\\\\////////////\\\25\\\\\\\
точки 1/2 и 25 не входят в решение неравенства х∈(1/2;25)
3х^2 + bx - 72 = 0
X1 = 8
3•64 + 8b - 72 = 0
8b = 72 - 192
b = - 120 : 8
b = - 15
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3x^2 - 15x - 72 = 0
3( x^2 - 5x - 24 ) = 0
D = 25 + 96 = 121 = 11^2
X1 = ( 5 + 11 ) : 2 = 8
X2 = ( 5 - 11 ) : 2 = - 3
Ответ:
Объяснение:
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