10 Equazioni e disequazioni di primo grado ESERCIZI 400 8 + 5x 12 1 4x __ _1_ x > _2_ 2 1 404 __ 3] 405 3x 2 5; x 5] 4 3 3 3 2 3 3 2 2 [x 4; x > 2] 5 2 2 _8_ _6_ _2_ _2_ [x > 3 ; x > 5] 17 ___ [x 71 ; x 0] 29 ___ 3 _6_ 2 Risolvi le seguenti disequazioni. 409 x 2(1 x) 3] _2_ 411 3(x 1) (x + 7) u 1 [u u(2 u) 5 [ ] 416 2(w + 3) + (w 1)(w + 1) 3(x + 6) [x > 10] [y 5] 418 (x + 3)(x 5) (x 1)2 3(x + 1) [x 3 ] 419 (2x + 1)(2x 1)2 3 4x2(2x 3) + 2( 2x)2 13 ___ [x 1] 420 2x2 x(1 2x) 2x(4x + 1) 1 _1_ 8 ___ [x > 13] x 2 x 3 x x 5 423 _____ _____ __ __ 2] 424 [x > 3] (2 3) 3 2 2 + x 4x + 13 (3 + x) ______ 2 4 ¯ 3 + 2x 0,3 x ______ 0,3 x _______ 0,¯ ______ + _____ 7 2 2 2 2 (2x 3) 1 __ + (x 5)2 ________ 2 4 3 425 426 427 428 429 430 _5_ [ ] [R] 3 ___ [x > 40] [x > 0] [x < 3] 93 ___ [x 28] 521