Question

Repede Urgent!!!!
10p​

Answer 1

Răspuns:

Salut!

Inlocuim x, a si b cu numerele date din cerință.

a) 3*x+7*a+7*b=

3*5+7*(a+b)=

15+7*13=

15+91 = 106

b) x*a+x*b-50=

5*a+5*b-50=

5*(a+b)-50=

5*13-50=

65-50= 15

c) 10*x+(4*a+4*b)=

10*5+4*(a+b)=

50+4*13=

50+52= 102

d) (4*a+4*b-2*x)*(2*a+2*b+x)=

[4*(a+b)-2*5]*[2*(a+b)+5]=

(4*13-10)*(2*13+5)=

(52-10)*(26+5)=

42*31= 1302

Sper ca te-am ajutat!

Answer 2

Explicație pas cu pas:

x=5, a+b=13

a) 3•X+7•a+7•b=3•5+7(a+b) = 15 + 7•13=15+91=106

c) 10•x+(4•a+4•b)= 10•5 + 4•(a+b)=50+4•13=50+52=102

b)x•a+x•b-50 = x(a+b) -50=5•13-50=65-50=15

d)(4•a+4•b-2•x)•(2•a+2•b+x) =[4(a+b)-2x]•[2(a+b)+x]=(4•13-2•5)•(2•13+5)=

(52-10)•(26+5)=42•31=1302