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Daca a×b=30si a×c=18,calculati;i)a×(b+c):16; ii)a×(b-c):4

Răspuns :

a) ab+ac supra 16 =30+18 totul supra 16 =48/16 = 3
b) a×(b-c):4 = ab -ac supra 4 = 30-18 totul supra 4 = 12/4 =3

Succes!
axb=30
a×c=18
ax(b+c):16=
(axb)+(axc):16=
(30+18):16=48:16=3

ax(b-c):4
(a×b)-(a×c):4=
(30-18):4=12:4=3