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Daca a×b=18, c×a=10 calculeaza: a×(b+c):7 si a×(b-c):8

Răspuns :

Miky93ask
ab+ac=10+18
a(b+c)=28
a(b+c):7=28:7=4
ab-ac=18-10
a(b-c)=8
a(b-c):8=8:8=1
Blacker29ask
ax(b+c):7 
(axb + axc):7
(18+10):7
28:7=4

ax(b-c):8
(axb - axc):8
(18-10):8
8:8=1

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