7. Calculati:
a) 4/3 + 5/7
b) 2/7 + 1/4
c) 5/8 - 5/9
d) 5/7 + 4/3
e) 1/4 + 2/9
f) 3/4 - 5/7
g) 2 1/2 - 1 1/5
h) 4 1/3 - 2 1/3
i) 1/10 + 13/40 + 7/20
j) 5/18 + 13/36 + 1/9
k) 9/10 + 11/100 + 1/50
L) 7/3 + 1/4 + 5/12
m) 5 2 + 1 5 + 3 10
n) 2/3 + 5/18 + 7/9
o) 23/24 - 1 48 - 1 6
p) 33/240 - 5/120 + 11/480
q) 13/2 + 45/4 + 23/8
r) 17/21 - 4/42 + 11/84
repede va rog
Răspunsuri la întrebare
Explicație pas cu pas:
a) 4/3+5/7=28/21+15/21=43/21=2 1/21
b) 2/7+1/4=8/28+7/28=15/28
c) 5/8-5/9=45/72-40/72=5/72
d) 5/7+4/3=15/21+28/21=43/21=2 1/21
e) 1/4+2/9=9/36+8/36=17/36
f) 3/4-5/7=21/28-20/28=1/28
g) 2 1/2 - 1 1/5 = 5/2-6/5=
= 25/10-12/10=13/10 =1 3/10
h) 4 1/3 - 2 1/3 =13/3-7/3=6/3=2
i) 1/10+13/40+7/20=4/40+13/40+14/40=31/40
j) 5/18+13/36+1/9=
=10/36+13/36+4/36=30/36=5/6
k) 9/10+11/100+1/50=
=90/100+11/100+12/100=113/100 = 1 13/100
l) 7/3+1/4+5/12=28/12+3/12+5/12=36/12=3
m) probabil ai vrut să scrii
5/2+1/5+3/10=25/10+2/10+3/10=30/10=3
n) 2/3+5/18+7/9=12/18+5/18+14/18=
=31/18=1 13/18
o) 23/24-1/48-1/6=46/48-1/48-8/48=37/48
p) 33/240-5/120+11/480=
=66/480-20/480+11/480=57/480=19/160
q) 13/2+45/4+23/8=
=52/8+90/8+23/8=165/8= 20 5/8
r) 17/21-4/42+11/84=
=68/84-8/84+11/84=71/84