340.
o2 = t
Z
H[hagZqbf 2 D = 4 − 4 ⋅ 4 ⋅ (− 15) = 256 ;
t1 =
⇒ x 2 = 1,5 beb x 2 = −2,5
[ Imklv o
⇒
−4 + 16 = 1,5 8
g_l dhjg_c
beb
4t 2 + 4t − 15 = 0 ; −4 − 16 t2 = = −2,5 8
x1 = 1,5
beb
x 2 = − 1,5
= t ⇒ 2t − t − 36 = 0 ; D = (−1) − 4 ⋅ 2 ⋅ (− 36) = 289 ; 1 + 17 1 − 17 t1 = = 4,5 beb t 2 = = −4 ⇒ x 2 = 4,5 beb x 2 = −4 g_l 4 4
dhjg_c
2
2
x1 = 4,5
beb
2
x 2 = − 4,5
341.
(
Z
)(
)
1 3 −6 1 a b ⋅ 3a − 2b 5 = ⋅ 3 a 3 ⋅ a − 2 b − 6 ⋅ b 5 = 2 2 3 3 − 2 − 6 + 5 3 −1 3a = a ⋅b = ab = 2 2 2b 1 − 3 3 [ 3a − b ⋅ (4ab ) = 3a − b ⋅ 4 −1 ⋅ a −1 ⋅ b −1 = 3 a −3 a −1 bb −1 = 3 a − 4 . 4 4 \ a–6b10(2a–2b4)–2= 4a −6b10 ⋅ 2−2 ⋅ a 4 ⋅ b−8
(
=
(
)(
]
10ab −5
)( )
)
4 −6 4 10 −8 a a b b = a −6+4 ⋅ b10−8 = a −2b 2 4 1 33
−2 3
a b
=
( )(
)
10 ⋅ 3 aa 2 b − 5b − 3 = 3a1+ 2 ⋅ b − 5 + (− 3) = 3a 3b −8 . 10
342.
Z 81 ⋅ 3− 6 = 34 ⋅ 3− 6 = 32 = 34 − 6 = 3− 2 = 1 [
(− 3 )
−3 3
−9
−2
\ 9 −5 ⋅ 1 9
]
9
=
(− 3) 4 − (3)−
−3
(− 3 ) ⋅ 27 −3 2
−9
=
3
4
3
9
= 3 4 −9 = 3 −5 =
( ) ⋅ (3 )
= 32 3
−5
− 2 −3
= 3 −10 ⋅ 3 6 = 3 − 4 =
( ) =3
= (− 3) ⋅ 3 −6
3 3
1 . 243
−6
⋅3 = 3 = 3 9
3
1 3
4
−6+9
=
1 . 81
= 33 = 27.
53
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