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: ................................................................................137 10: .......................... 157
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14.
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15.
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x Ax .
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A B
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16.
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B
A
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17.
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= 3x = 3.
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x
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18.
1
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AM M2
.
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2
.
(1),(2) A
2 2 2 2
.
2
= = = = :
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i. = ii. + = + 2
i.
1
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AM M2
.
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2
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2
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M N
A B
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19.
i. = x = = y = , :
2x 2y x y
2 2
ii. + = 2x + + + 2y = 2x + + 2y + = + .
3
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i.
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.
K A
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20.
3 3 3= + = +
3 4 4 4 4 4 4 3
4= = = =
3 47 3 4 7
+= + =
5
, , , = = ,
. : ( ) ( ) ( )2 1 1
= + .
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= + .
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2
+ = .
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1 1 1 12
+ + + = + =
.
1. , , ,
< .
i. , < 2
ii. , > 2.
A M
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21.
2. , , , . 2 > .
3. , , , ,
.
2
, = + .
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MA MB3
= .
, 5
3
= ,
: ( ) ( ) ( )1 1 1
= + .
5. ,,, = 2 = 3.
,, ,
= .
.
, , > > :
+ +
< < 3
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