aflati valuarea nr natural x, stiind ca : a) 2+2×[1+2×(1+2x)]=80;
b) (x+1)(x+2)=56;
c) (x:50+30):6-6=0;
d) [2×(x+2)×5+3×(x
+2)]×7=273
Va rog ajuatati-ma!!!!