5. a. 0.2+0.8*0.25=0.2+0.8=1
b. 1.(6)+8= 9.(6)
c. 0.3+0.(3)*0.5=0.3+0.1(6)=0.4(6)
d. 1,(3)+0,7*0.5=1,(3)+0,35+1.68(3)
6. a. 1,646*10=16,46
b. 2,3* 25+102=57,5+102=159,5
c. 6,52*11-2,4=71,72-2,4=69,32
d. 2.541+0.35*50=2.541+17.5=20.0041
e. 20*4,5+0,75:2+1=90+0.375+1=91.375
f. 14,11*3,4+64;8+ 7 la puterea a 2-a= 47,974+8+7=62,974
