1 2 2 3 2 ESERCIZI Operare con numeri e lettere 3 x x y y x x xy + y 626 __2 __________ ___________ 2 2 2 y xy _1_ [x] xy 1 1 + a _____ 1 + a 1 + a _____ 1+a 627 __ _____ + 3 _____ 5 2 4 a a a a 2a 1 _______ [ a 2 b + c 2ab + bc + c a + b 2ac + 3ab 628 _____ ____________ + _____ _________ 4a 4ac 2c a a b a ___ 629 1 _____ x 1 _1_ + _____ 5 2 630 ______ _____ 3a _3_ ______ y x 631 _____ + _______ 2b 3 _______ + _____ a b c 632 _____ _____ + _____ 2 _____ 2 2a 2 x+y a a 1 3x + 3y x y y x x y 2 b _______ 1+x _____ ; [ b a x(x + 1) ] x+1 1 3 _______ ; _______ a2 a ab ac [ 2(a 1) a + b + c _____ 2z ________ ; [ x y 633 1 + _____ a + b ______ 4ab _____ 1 1 634 ______ + ______ 4 2 _____ _____ 2r s 635 2r + s _a_ p q _b_ a _____ a b _____ 2(p + 3q) 4r _____________ ; ____________ [ (2r s)(2r + s) (p q)(p + q) ] p+q 2a + 9 2 ______ 4a + 4 (1 + b) + (1 + a) 2 2 2 2 2 [ 4 2 636 _____ + _____ x y x +y ______ _____ 3a 5a 637 ______ ______ 2r 3s _______ + _______ 3 2a 2b 638 _____ _______ 2 2 5x + 5y 4 ___________ _____ x + 1 _____ x 639 ______ 3 2a + 1 1 ________ _______ x 1 1 x 2a 2 a+b 4a 4 5r + 5s 3 x 1 x 1 3x 2y 2 641 ___________ + _____ 2 2 2 3 _____ ______ 2(b a) 3 642 _____ + ____________ 2 2 x+y x 1 __________ _____ + x+y x + 2xy + y a b u v x3 8 y 1 a 2ab + b 3s 3s _______ _______ 1+m 3r 3s 4 a a 4 a b 645 ______ 2 2 a b 4 3 a + ab _______ ab ( a + ab ) 2 2 2x y x 2y 2x 646 ______ + ______ ______ 2 2 x y x+y x y 2 3(2a + 1)(8a3 1) ] a + 1 _______ 2u _______ ; 5x _______ ; [ (x + y) 2 2 2x + 4x + 5 ___________ 8 x3 ] xy + 1 1 _______ _____ ; [ a b (y 1)2 ] y2 2y + 1 3a 1 3a 644 _____ + ______ 2 a 1 2 1 x3 [ (a + b)2 (u v)2 ] x 2 2 m _____ ______ y+x 3 x + x 1 ________________ 8a + 2a + 2 __________ ; [ (v u)2 2x 3y + 1 9 + 4y 643 __________ + ______ x+y [a + b x + y] 4a 1 2 2v _____ + _______ (a + b) 1 _____ 1 _____ ; x+y 2a + 1 a 640 ____________ _______2 2 2 a + 2ab + b a 2r2 + rs + 3s2 _______ ; ____________ [ 4(a 1) 5(r s)(r + s) ] 2 24a 3 4(a + 1) ] ab 2xy 2 ______ _____ ; [ x 1 x2 y2 ] 5(r s) x2 + 2xy + y2 a b (a + b) _______ 6a 1 _______ ; x+y x y z + 1] [a 1; a + b] a2 b2 a b a(a 1) ] 3x + y _____________ 2b + 3a _______ ; [ 3(x + y) a(b c) ] b c z+1 1 a 1 ] [ 3b ] 6bc x a5 2x + y + 10 ______ m 2 __________ ; m2 1 [ x+y m2 1 ] 2 3a 3a + 1 _______ s ___________ ; [ 4(r s) a(a 1) 4(r s) ] b a 1 2 1 ________ __ + _______ (a a2 ab) ab a2 [2ab ; a ] 2b ______ a 2b 4b ___ + 1 + ______ x y ___ 2b ______ ; [x + y a ] a a + 2b a + 2b 1 __ 79