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a+ b+ c+ d=42
b= a+ 5
c= b+ 5
d= c+ 5
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a, b, c, d=?


Răspuns :

a+b+c+d = 42
b = a+5
c = b+5 , c = a+5+5, c = a+10
d = c+5, d = a+10+5, d = a+15
inlocuim in prima si aflam pe a
a+a+5+a+10+a+15 = 42
4a = 42-(5+10+15)
4a = 42-30
4a = 12
a = 12:4
a = 3
b = a+5
b = 3+5
b = 8
c = b+5
c = 8+5
c = 13
d = c+5
d = 13+5
d = 18

b=a+5 c=b+5=a+10 d=c+5=a+15 a+a+a+15+10 +5= 42 3a+30=42 3a=12 a=4 b=9 c=14 d=19