14 BOOK OF MATHEMATICAL PROBLEMS. 



40 20 8 12 



* + * *- + 



(a? -!)(*+ 2) 



(30) (x*+l)*=(2x-l), 



o . 



OX = 



. - - :r -- ; - r, 



x 2 + ^ + 3 x 4 + x + 1 



(33) cc 8 



(34) 4 



(35) x 3 + 6x* = 36, 



(3 6) xy (x + y) = 1 2# + 3y, acy (4a? + y - a;y) = 1 2 (re 4- y - 3 ) , 



(37) 



(38) xyz = a(y* + z*) 



11 11 11 



(39) , T -- , - 



ax by c z 



nt\\ 8 8 



40) 



(41) 



(42) 2^ + ^ = 



