class-viii-math-bv-set-a-mcq-f-2-2014

1 0 9

 

1 3 x 7 11 p + 3q x

x2 

1 x2

9 13 p26pq +9q2 p22pq+3q2

p2+6pq +9q2 p2+2pq +3q2 m = 1

1 1 2 2 x -y , 2(x +y) (x +y)(x-y) 2xy(x2-y2)

i. ×

ii.

m2 +

×

1 m2

0 2 2 2x y +2xy2 4xy(x +y)(x-y) 4xy(x2- y2)

iii. i, ii i, iii

ii, iii i, ii iii

i, ii i, iii

ii, iii i, ii iii

x + y = 3, x  y = 1 i. ii. x = y +1 iii. (x, y) = (2, 1)

i. ii. iii.

i ii i iii x + y = 9, x – y = 3



ii iii i, ii iii

 x=3–y x= y3

x = y+3 y=x+3

x 3 5

4 6

A= 60

ABCD 30 150

D 120 320

y 1 3

A

2 6

b3 a 2  ab  b 2

a3 a 2  ab  b 2

ab 1 ab a3 a 2  ab  b2 ab 1 ab b 2 a  b2 ab ab 1 ab

a+b 1 ab b3 a 2  ab  b 2

D 13

C

B 12

i. AB = 5 ii.

34

 ABC

iii.

i iii ii iii

a+b 1 ab b ab

60 i ii i, ii iii

2

3

2

2

4 ab ab 1 ab

 1  2

2 





r i. ii. iii. i ii ii iii

i iii i, ii iii

r2

2r

4r

n

  = {1, 2, 3, 4}, B = {2, 3} C = {1, 4} B C {2,3} {1,2,3,4} {1,4} {1,2,3} B C {3} {4 }  {1,2,3,4}

r

n n 2

n+1 2

n1 2

n 2+1

 i ii iii i ii ii iii

i iii i ii iii