Răspuns :
a) a(b+c)=4·(-12)=-48
a·b+a·c=a(b+c)=4·(-12)=-48
b) a·b-a·c=a(b-c)=(-8)·(-34)=282
c) a·b+a·c=-45⇒a(b+c)=-45
d)a·b-a·c=-54⇒a(b-c)=-54
e)a(b+c)=78⇒ab+ac=78
f)a(b-c)=-36⇒ab-ac=-36
g)a(b+c)=ab+ac=(-15)+24=9
h)a(b-c)=ab-ac=(-31)-(-10)=(-31)+10=-21
a·b+a·c=a(b+c)=4·(-12)=-48
b) a·b-a·c=a(b-c)=(-8)·(-34)=282
c) a·b+a·c=-45⇒a(b+c)=-45
d)a·b-a·c=-54⇒a(b-c)=-54
e)a(b+c)=78⇒ab+ac=78
f)a(b-c)=-36⇒ab-ac=-36
g)a(b+c)=ab+ac=(-15)+24=9
h)a(b-c)=ab-ac=(-31)-(-10)=(-31)+10=-21
a) inlocuim si obtinem a(b+c)=ab+ac=4*(-12)= - 48
b) ab - ac = a (b-c)=( - 8)( - 34)=272 pt ca - * - = +
c) a(b+c)= ab+ ac = - 45
d) cred ca e gresit ex . Trebuia ab+ac
e) ab+ac=a (b+c)= 78
f) ab - ac=a(b-c)= - 36
g) a (b+c)=ab+ac= -15 + 24=9 (scazi numerele si pui semnul numarului cel mai mare)
h) a(b-c) = ab - ac= (-31) - (-10)= (- 31 )+ 10= - 21 (pt ca - * - = +)
b) ab - ac = a (b-c)=( - 8)( - 34)=272 pt ca - * - = +
c) a(b+c)= ab+ ac = - 45
d) cred ca e gresit ex . Trebuia ab+ac
e) ab+ac=a (b+c)= 78
f) ab - ac=a(b-c)= - 36
g) a (b+c)=ab+ac= -15 + 24=9 (scazi numerele si pui semnul numarului cel mai mare)
h) a(b-c) = ab - ac= (-31) - (-10)= (- 31 )+ 10= - 21 (pt ca - * - = +)