പപാദവപാര്‍ഷഷിക മൂലല്യനഷിര്‍ണയയം -- 2016

ഗണഷിതയം

കപാസസ്സ് -IX

BINOYI PHILIP, GHSS KOTTODI 9446270923

(i) ∆ABD, ∆ABC (ii) ∆ACD, ∆BCD

3 = 30 4 40 3 < 31 < 32 < 4 4 40 40 5

4 = 40 5 50

ഒര പപനയടട വഷില = x ഒര ടപനസഷിലഷിടന വഷില = y 4x + 3y = 49...............(1) 9x + 3y = 99...............(2) (2) – (1) ..> 5x = 50 x = 50/5 = 10 x = 10 (1) 4 x 10 +3y = 49 40 + 3y =49 3y = 49 – 40 = 9 y = 9/3 = 3 ഒര പപനയടട വഷില = 10 രപ ഒര ടപനസഷിലഷിടന വഷില = 3 രപ

AB = 9 cm BC = 12 cm ∆ABD യടട പരപളവസ്സ് : ∆BCD യടട പരപളവസ്സ് = AB : BC = 9 : 12 = 3 : 4

(i)

(ii)

x2 – (x – 4)2 = 4 (x – 2) x 2 x–2=9 &x–4=y x = 11 & y=7 2 2 x – (x – 4) = (x + x – 4) (x – x + 4) = (2x – 4) 4 = 2(x – 2) 2 = 4 (x – 2) x 2 (x – 2) x 2 (x – 2) x 2 (x – 2)

പതഷിടന സപാനടത അകയം = x ഒനഷിടന സപാനടത അകയം = y x + y = 9......................(1) 3x +1 =y 3x – y = -1 ...................(2) (1) + (2) ......> 4x = 8 x = 8/4 = 2 x = 2 (1) ല ആപരപാപഷിചപാല 2+y=9 y = 9 – 2= 7 സയംഖല്യ = 27

n ഏതസ്സ് എണലസയംഖല്യ ആയപാലയം n3 + n2 + n = n( n2 + n + 1) = n n2 + n + 1 n2 + n + 1 ie 2, 3, 4 എനന സയംഖല്യകളക പകരയം ഏതസ്സ് എണല സയംഖല്യ എടതപാലയം ഈ ബനയം ശരഷിയപാകയം.

(i) AP : PB = 1 : 2 ആയതഷിനപാല ∆APC യടട പരപളവസ്സ് ∆ABC യടട പരപളവഷിടന 1/3 ഭപാഗമപാണസ്സ്. (ii) PQ : QC = 1 :2 ആയതഷിനപാല ∆APQ ടന പരപളവസ്സ് ∆AQC യടട പരപളവഷിടന 2/3 ഭപാഗമപാണസ്സ്. ∆AQC യടട പരപളവസ്സ് ∆ABC യടട പരപളവഷിടന 1/3 ഭപാഗതഷിടന 2/3 ഭപാഗമപാണസ്സ്. ie 1/3 x2/3 = 2/9 ഭപാഗമപാണസ്സ്.

പനപാടസ്സ് ബകഷിടന വഷില = x പപനയടട വഷില = y ie 5x + 4y = 148 .............(1) 4x + 5y = 140..............(2) (1) + (2) ....> 9x + 9y = 288 x + y = 32 ....................(3) (1) – (2) ....> x – y = 8.......................(4) (3) + (4) 2x = 40 x = 20 x = 20 (3) ല ആപരപാപഷിചപാല 20 + y = 32 y = 32 – 20 = 12 പനപാടസ്സ് ബകഷിടന വഷില =20 രപ പപനയടട വഷില = 12 രപ

(i) (ii)

6 = 9 = 6 + 2 x 9 = 24 8 12 8 + 2 x 12 32 a = c = k b d a = bk c = dk a + nc = bk + ndk = k(b + nd) b + nd b + nd b + nd

=

k= a b

ലയംബവശങളഷില ഒനഷിടന നനളയം = 4.5 cm രണപാമടത വശതഷിടന നനളയം = x കര്‍ണതഷിടന നനളയം = 18 – (4.5 + x) = 13.5 – x പപഥപഗപാറസസ്സ് സഷിദപാനപകപാരയം (പപാദയം)2 + (ലയംബയം)2 = (കര്‍ണയം) 2

x2 + 4.52 = (13.5 – x)2 x2 + 20.25 = 182.25 – 27x +x2 27x = 182.25 – 20.25 = 168 x = 162/27 = 6 കര്‍ണതഷിടന നനളയം = 13.5 – 6 = 7. 5 cm

AE : EB = 2 :3

∆ABD ഒര സമഭജ തഷിപകപാണമപാണസ്സ്.(AB=AD)
=

7 + 1 x ( 1 + 3 ) 10 100 7 = 7 + 1 + 3 10 100 700 = 7 + 1 + 1 x 30 10 100 1000 7 = 7 + 1 + 1 x( 4 +2 ) 10 100 1000 7 = 7 + 1 + 4 + 2 10 100 1000 7000 = 7 + 1 + 4 + 1 10 100 1000 3500 ie a = 7, b = 1, c = 4 & x 1/3500

നനളയം = x വനതഷി = y പരപളവസ്സ് = xy (x + 3) (y + 2) = xy + 52 xy + 2x + 3y + 6 = xy + 52 2x + 3y = 46.........(1) (x – 2) (y – 3) = xy – 43 xy – 3x – 2y + 6 = xy – 43 3x + 2y = 49 ........(2) (1) + (2) .... 5x + 5y = 95 x + y = 19..............(3) (2) – (1) ..... x – y = 3................(4) (3) + (4) ....... 2x = 22 x = 22/2 = 11 x = 11 (3) ല ആപരപാപഷിചപാല 11 + y = 19 y = 19 – 11 = 8 നനളയം = 11m വനതഷി = 8 m

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(i) (1/10 +1/11) / (1/10 – 1/11) = 10 + 11 =21 (ii) ( 1 + 1 ) / ( 1 - 1 ) = ( n + 1) + n / ( n + 1) - n n n+1 n n+1 n(n + 1) n(n + 1) 2n + 1 x n(n+1) = 2n + 1 n(n+1) 1

(i) ∆ADB (ii) ∆AEB

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(i) 3/5, 2/5 വവലകമങളടട തക = 5/3 + 5/2 = 25/6 വവലകമങളടട ഗണനഫലയം = 5/3 x 5/2 = 25/6 രണയം ഒപര സയംഖല്യയപാണസ്സ് (ii) y/x , (x – y)/x വവലകമങളടട തക = x + x y x–y = x(x – y ) + xy y ( x – y) = x2 – xy + xy xy – y2 = x2 xy – y2 വവലകമങളടട ഗണനഫലയം = x X x y x–y = x2 xy – y2 രണയം ഒപര സയംഖല്യയപാണസ്സ് OR (i) x/y = 7/5 = k x = 7k, y = 5k (x + y) / (x – y) = (7k + 5k)/(7k – 5k) = 12k/2k = 6 (ii) ( x2 + 2)/(x2 – 2) = 99/97 99(x2 – 2) = 97( x2 + 2) 99x2 – 198 = 97x2 + 194 2x2 = 392 x2 = 292/2 = 196 x = √196 = 14 സയംഖല്യ = 14

ലയംബകയം ABDC യസ്സ് തലല്യപരപളവള തഷിപകപാണമപാണസ്സ് ∆AEC OR

ചതര്‍ഭജയം ABCD യസ്സ് തലല്യപരപളവള തഷിപകപാണമപാണസ്സ് ∆AED

(i)

8 = 10 12 15

= 3 x 8 + 5 x 10 = 24 + 50 = 74 3 x 12 + 5 x 15 36 + 75 111

(ii)

a = c =k b d ie a = bk & c = dk ma+ nc = mbk + ndk = k(mb + nd) = k = a mb + nd mb + nd mb + nd b

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