Buna dimineata...ex 3 dar va rog detaliat si explicit. Va mulțumeesc.Ofer coroana​

Răspuns:

desfacem paranteza

a×(b+c) = a×b+a×c

avem

a×b=70 +

a×c=28 le adunam

a×b + a×c =70+28=98

Răspuns:

2*[3+(4+c):5]-6*7=15-1

2*[3+(4+c):5]-6=14:7

2*[3+(4+c):5]=2+6

3+(4+c):5=8:2

(4+c):5=4-3

4+c=1*5

c=5-4

c=1

[tex]3.)[/tex][tex]a*b+a*c=a(b+c)=70+28=98[/tex]

[tex]4.)a*b-a*c=54-12\\\\a(b-c)=42= > 7a=42= > a=42:7= > a=6\\\\6b=54= > b=54:6= > b=9\\\\6c=12= > c=12:6= > c=2[/tex]