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Daca axb=18,cxa=10,calculeaza:ax(b+c):7 si ax(b-c):8.

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Haidauemilask
a*b=18
c*a=10
__________
(a*b)+(c*a)=18+10
a*(b+c)=28
a*(b+c)/7=28/7=4


a*b=18
c*a=10
_____________
(a*b)-(c*a)=18-10
a*(b-c)=8
a*(b-c)/8=8/8=1





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