1. Efectuează:<br />a) 503 - 127-205-189-64;<br />21 189 + 16 347 -20 508;<br />b) 185 × 25 × 36: 15-20<br />895 : 5× 36:9× 29.<br />c) 26 + 360 : (3 x 50 x 5: 750);<br />105 - 2× [11+5× 3-(4+8):<br />d) [1609:3+72:3) 3 - 75×]×2<br />3× [90: 45.2× 165: 13.10.2003​