Risposte

2013-12-17T22:15:35+01:00
Risolvere il sistema d equazione.x-y=18 e x+Y=42.                                                         x=30 e y=12.                                                                                                             l altezza =(7/4)di 12  =21                                                                                            l area (30+12)per21/2=441m quadro