a) 6/17+7/17=13/17
b) 15/43+18/43=33/43
c) 11/5+5/7=77/35+25/35=102/35
d) 3/4+7/3=9/12+28/12=37/12
e) 3/13+1/11=33/143+3/143=36/143
f) 7/3–2/3=5/3
g) 4 întregi 2/3–1 intreg 1/6=14/3–7/6=
28/6–7/6=21/6(se simplifică cu 3)=7/2
h) 11/15–2/5=(se aducem la numitor comun care este 15) 11/15–6/15=5/15(se simplifică cu 5) =1/3
i) (1/2+3/4+5/6) + (1/2+1/4+1/6)
=(6/12+12/12+10/6)+(6/12+3/12+2/12)
=38/12+11/12
=49/12
j) (1/21+1/14)–(1/35–1/42)+(1/14–1/21)
=(2/42+3/42)–(6/210–5/210)+(3/42–2/42)
=5/42–1/210+1/42
=25/210–1/210+25/210
=24/210+25/210
=29/210
k) 0,25+0,39=25/100+39/100=64/100=32/50=16/25
l) 16,8+7,21=168/10+721/100=1680/100+721/100=2401/100
m) 0,(4)+0,(31)=4/9+31/90=40/90+31/90=71/90
n) 15,4(3)+0,4(6)=15 întregi 1543–4/9+46–4/9=15 întregi 1539/9+42/9=1674/9–42/9=1632/9
o) 5/10–0,25=5/10–25/100=50/100–25/100=25/100=1/4
p) 17,2–5,1=172/10–51/10=121/10
q) 137/100–0,12=137/100–12/100=125/100=25/50=5/10=1/2
Sper ca te-am ajutat ! ^_^
