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Denisadeloa
a fost răspuns

(-13/10)+(+4/15)+(-7/30)+(+1/12)=
-(9/28)+(+7/42)+(-5/14)+(+4/21)=
(-5/24)+(+7/36)+(-11/12)+(+1/18)=
(-5/42)+(-2/56)+(+4/63)+(-5/84)=

Răspuns :

Mary86angel
a)
(-13/10)+4/15+(-7/30)+1/12
-13/10+4/15-7/30+1/12
-71/60
b)
-9/28+7/42+(-5/14)+4/21
-9/28+7/42-5/14+4/21
-9/28
c)(-5/24)+7/36+(-11/12)+1/18
-5/24+7/36-11/12+1/18
-7/8
d)
(-5/42)+(-2/56)+4/63+(-5/84)
-5/42-2/56+4/63-5/84
-19/126

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