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a fost răspuns

a) (-2/5) + (-3/10) + (+1/2) + (+4/15)=

 

b) (-5/3) + (-5/0) + (+5/2) + (-5/2)=

 

c) +7/18) + (-3/2) + (-11/9) + (+4/1)=

 

d) (-2/21) + (-3/7) + (+5/42) + (-9/14)=

 

e) (-7/11) + (-1/4) + (+1/2) + (-5/22)=

 

f) 2/7 + (-1/14) + (+5/6) + (-13/42)=

Răspuns :

a) (-2/5) + (-3/10) + (+1/2) + (+4/15)= -4/10-3/10+5/10+4/15=-2/10+4/15=-6/30+8/30=14/30 simplif.=7/15
b) (-5/3) + (-5/0) + (+5/2) + (-5/2)= nu exista 5/0
c) +7/18) + (-3/2) + (-11/9) + (+4/1)= 7/18-27/18-22/18+72/18=-20/18-22/18+72/18=-42/18+72/18=30/18=simplif.=10/6
d) (-2/21) + (-3/7) + (+5/42) + (-9/14)=-2/21-9/21+5/42-9/14
=-11/21+5/42-27/42=-22/42-22/42=-44/42=-22/21
 e) (-7/11) + (-1/4) + (+1/2) + (-5/22)= -14/22-5/22-1/4+2/4=-19/22+1/4=-38/44+11/44=-27/44
f) 2/7 + (-1/14) + (+5/6) + (-13/42)=4/14-1/14+35/42-13/42=3/14-22/42=9/42-22/42=-13/42

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