Question

Calculati numarul x,stiind ca a-b=6 si:
a)x+3•a-3•b=20
b)x•a-x•b+9a-9b=654
c)7•a-7•b+x=55
d)13+x-(5•a-5•b)=2011
Dau coroana! :)​

Answer 1

Răspuns:

Explicație pas cu pas:

a)x+3•a-3•b=20

x + 3*(a - b) = 20

x + 3*6 = 20

x + 18 = 20

x = 20 - 18 = 2

b)x•a-x•b+9a-9b=654

x*(a - b) + 9*(a - b) = 654

(a - b)*(x + 9) = 654

6*(x + 9) = 654

x + 9 = 654 : 6 = 109

x = 109 - 9 = 100

c)7•a-7•b+x=55

7*(a - b) + x = 55

7*6 + x = 55

42 + x = 55

x = 55 - 42 = 13

d)13+x-(5•a-5•b)=2011

13 + x - 5*(a - b) = 2011

13 + x - 5*6 = 2011

13 + x - 30 = 2011

x = 2011 + 30 - 13 = 2028

Answer 2

Răspuns:

a). x+3(a-b)=20

x+3x6=20

x=20-18=2

b). x(a-b)+9(a-b)=654

6x+54=654

6x=654-54

6x=600

x=100

c).7(a-b)+x=55

42+x=55

x=55-42

x=13

d). 13+x-5(a-b)=2011

13+x-30=2011

x-17=2011

x=2011+17

x=2028

Explicație pas cu pas: