a) 30: (1/10-1/10:3)=30:(1/10-1/10×1/3)=30:(3/30-1/30)=30:2/30=30×30/2=450
b)1/4×(3+3×0,(6)/2)=1/4(3+3×6/9:2/1)=1/4×(3+3×6/9×1/2)=1/4(3+1)=1/4×4=1
c) 2,1(3)×3/2la a5a+(1/2-1/5)la a2a×2²=2intregi si 13-1/90×3/32+64/100×4=192/90×3/32+64/100×4=1/5+64/25=64+5/25=69/25
d) 5,16+9,04-13,01=516/100+904/100-1301/100=1817/100
e) 0,7:7,3×10+1/3=73/100:73/10×10+1/3=73/100×10/73×10+1/3=1+1/3=4/3
f) (529/100:529/1000:4/10)²:625+1-1=(529/100×1000/529:4/10)²:625=625:625=1
g) (68000×1/1000):17/4-6+3/5-16/10=68/1×4/17-6+3/5-16/10=16-6+3/5-16/10=10+3/5-16/10=100+6-16 totul pe 10=100-10 totul pe 10=90/10=9
h) 1998×666+37 totul pe 666 - 1966×333+29 totul pe 333=1330705/666-664697/333=1330705-(664697×2) totul pe666=1329394-1330705 totul pe 666=1311/666
i) (15/10+3/9:2)×25/100=(15/10+3/9×1/2)25/100=(15/10+3/18)25/100=270+30 totul pe 180×25/100=300/180×25/100=15/36
