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

 1 0 9

 {x : x A = {x : x B= {x:x A C = A\B



} x  7} 1<x <10} (AB) C = A  (BC) (A B ) = AcBc c





3

60

5

X

Y

y = 90 YZ

 1 2 x  , y  y  (a  1)(a  2) x

x

1 =2 x

x3 

OE

1 x3

ZX2 = XY2 + YZ2.

D Y = 90 PQ RS OF

PQ = RS PQ > RS

x 4  119 

=3 7 1

O

Z

O OE < OF.



1 x4 2

2

PQ

ZX2 + DY2 = DX2 + DZ2.

PQ RS

RS