B4=6, b9=192, q=?
b2=b1.q, b3=b2.q=b1.q.q, b4=b3.q=b1.q³, ........b9=b4.q.q.q.q.q=b4.qˇ5
qˇ5=b9/b4, qˇ5=192/6=32, q=2
Log₀,₅ (2x+1)>-2⇔ { 2x+1>0 и log₀,₅ (2x+1)> log₀,₅ (0,5^(-2)) ⇔
{2x+1>0 { x>-1/2
{(2x+1)<4 ⇔ { x<3/2 -----------(-1/2)/////////////////////////(3/2)-----
x∈(-1/2;3/2)
1) 6х(2х-5у)/6х(5х-2у)=2x-5y/5x-2y
2) 6a(6a+4b)/6a(4a+6b)=6a+4b/4a+6b
3) m³-3m²n/3m²n-3m²=m²(m-3n)/3m²(n-1)=m-3n/3(n-1)
4) a³-2a²b/2a³b²-a⁴b=a²(a-2b)/a³b(2b-a)=-a²/a³b
3*1/2+2*(-1)+3=1,5-2+3=2,5
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2x²-20x+50=2(х²-10х+25)=2(х-5)²