в) г) д) =
е)
2 10 − 5
=
4 − 10 9−2 3
2 2⋅5 − 5 ⋅ 5 2 ⋅ 2 − 10 3⋅3 − 2 3
=
3 6 −2 2
2+ 6 − 2
2⋅ 2+ 2⋅ 3− 2
2 ( 2 + 3 − 1) 10 + 3 − 1
=
=
;
2 3
;
2
2⋅ 2⋅ 3+ 3⋅ 3⋅ 2 − 2⋅ 3
=
2 ⋅ 3 ( 2 + 3 − 1) ( 10 − 1) 2 − 3
3 (3 3 − 2) 2 (3 3 − 2)
5
=
2 (2 2 − 5 )
=
3 2⋅ 3−2 2
2 3 +3 2 − 6
5 (2 2 − 5 )
=
=
= 3;
( 10 − 1 − 3 )( 10 − 1 + 3 ) 10 + 3 − 1
= 10 − 1 − 3.
497. а) б) в) г) =
д) е) =
1+ a a
=
y+b y b y x − ax a x
(1 + a ) a a⋅ a
y ( y + b)
=
a +a ; a
=
b y
=
x( x − a)
=
a⋅ x
a b +b a
=
ab
y ( y + b) = by
=
y +b ; b
x ⋅ x( x − a) a⋅ x ⋅ x
( a b + b a ) ab ab ⋅ ab
=
x− a ; a
a b ⋅ ab + b a ⋅ ab = ab
ab a + ab b ab( a + b ) = = a + b; ab ab 2 3 −3 5 3 2−3 2 4 2
3 ⋅ 3 (2 3 − 3)
= =
5⋅ 3 ⋅ 3 (2 − 3 2 ) 2
2 2 −6 = 8
4 2⋅ 2
=
=
2− 3 ; 5
2 2 − 3 2 ⋅ 2 2 2 − 3⋅ 2 = = 4⋅2 8
2 −3 . 4
498. а)
=
x − xy + y x− y
=
( x − xy + y )( x + ( x − y )( x +
y) y)
=
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