Question

> 40.Află numerele a, b,c,d ştiind că :
a+b=70 ; b+c=50 ; c+d=30 ; (a+b)-(c+d)=(a+b+d) : 2 dau coroana​

Answer 1

(a + b) - (c + d) = (a + b + d) : 2

70 - 30 = (70 + d) : 2

40 = (70 + d) : 2

80 = 70 + d

d = 80 - 70

d = 10

c = 30 - 10 = 20

b = 50 - 20 = 30

a = 70 - 30 = 40

Answer 2

Răspuns:

a+b=70

b+c=50

c+d=30

(a+b)-(c+d)=(a+b+d):2

70-30=(70+d):2

40·2=70+d

80-70=d=>d=10

c+10=30=>c=30-10=>c=20

b+20=50=>b=50-20=>b=30

a+30=70=>a=70-30=>a=40