B1=x–7
b2=x+5
b3=3x+1
q=b2/b1=(x+5)/(x–7)
q=b3/b2=(3x+1)/(x+5)
(x+5)/(x–7)=(3x+1)/(x+5)
(x+5)^2=(3x+1)(x–7)
x^2+10x+25=3x^2–21x+x–7
2x^2–30x–32=0 |:2
x^2–15x–16=0
x1+x2=15
x1•x2=–16
x1=16; x2=–1
При х=16:
b1=16–7=9
b2=16+5=21
b3=3•16+1=49
q=21/9=7/3
При х=–1:
b1=–1–7=–8
b2=–1+5=4
b3=3•(-1)+1=–2
q=4/(-8)=–1/2
X²-2x-3>0
D=4+12=16
x=(2+4)/2=3
x=(2-4)/2=-1
+ - +
____-1________3__________
x∈(-∞;-1)∪(3;+∞)
2x-5≤0
2х≤ 5
х≤2,5
х∈(-∞; 2,5]
2х²-10х=0
2х(х-5)=0
2х₁=0
х₁=0
х₂-5=0
х₂=5
0;5
Ответ:
11*√84 *√4*√84=(√84*√84)* 11*2 =84*22=1848
Объяснение:
√84*√84= 84
√4=2
21*4 =84