Решение:
1) 1/(х-1) + 1/(х-1)*(х+1) = 5/8
2) х+1 +1/ (х-1) * (х +1) = 5/8
3) (х+2) * 8 = 5*( х+1)* (х - 1)
4) 8х + 16 = 5 (х^2 -1)
5) 8х + 16 = 5х^2 -5
-5х^2 +8х +21 = 0
D = 64 - 4*(-5)*21 = 484
x1 = -8 + 22/ -10 = -1,4
х2 = -8 - 22/ -10 = 3
Ответ: Х1 = -1,4; Х2 = 3;
У^2+3у-2у-6-у+2-5=0
У^2-9=0
У^2=9
У1=3
У2=-3
D=6-4=2
a11=a1+(n-1)*d=4+20=24
ответ:24
1.а)
4^-2 • 16 = 4^-2 • 4^2 = 4^0 = 1
1.б)
2^8 : 2^-13 = 2^-5 = 1/32
1.в)
( 6^3 )^-3 : 6^-12 = 6^-9 : 6^-12 = 6^3 = 216
1.г)
24•2^-5 + 5^-2 • 125 = 24•2^-5 + 5 = (24/32) + 5 = 5,75
2)
1) y^9 • ( y^3 )^8 = y^9 • y^24 = y^33
2) ( y^5 )^6 = y^30
3) y^33 : y^30 = y^3
4) y = ( - 5 )
( - 5 )^3 = - 125
3)
52000000 = 5,2 • 10^7
0,00281 = 28,1 • 10^-4