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http://apruebalasmates.blogspot.comtg 10 1040 º = → x = = 11.x tg 40º92 metrostg 10 1025 º = → y = = 21.y tg 25º45 metrosCuerda=x + y = 21 .45 + 11.92 = 33. 36 metrosEjercicio 5⎧⎪x =⎨y =manzanas ⎧ 2x+ y = 5.5 ⎧ y = 5.5 − 2xperas →⎪⎨x+ 3z= 4.4 → ⎪ 4.4 − x→⎪⎩ z = patatas ⎪⎨z=⎩2x+ 2y+ 2z= 8.6 ⎪3⎩2x+ 2y+ 2z= 8.6⎛ 4.4 − x ⎞8.8 − 2x2x+ 2·(5.5 − 2x)+ 2· ⎜ ⎟ = 8.6 → 2x+ 11−4x+ = 8. 6 →⎝ 3 ⎠36x+ 33 −12x+ 8.8 − 2x25.8−16→= → − 8 x = −16→ x = = 233− 8 kgde€manzanasy = 5.5− 2x= 5.5 − 2· x = 5.5 − 2·2= 1.54.4 − x 4.4 − 2z = = =3 32.43= 0.8kgkg€de€de patatasperasPor tanto el kilo de manzanas cuesta 2e, el kilo de peras cuesta 1,5€ y el kilo de patatascuesta 0,8€.Ejercicio 6Las dos relaciones son inversas.http://apruebalasmates.blogspot.com

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