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aflati nr a,b,c stiind ca a+b:2+c:2=45,a:2+b+c:2=48,a:2+b;2+c=51

Răspuns :

a+b/2+c/2=45
a/2+b+c/2=48
a/2+b/2+c=51

a+b/2+c/2=45 => a= (90-c-b)/2

(90-c-b)/2/2+b+c/2=48
(90-c-b)/2/2+b/2+c=51

(90-c-b)/2/2+b+c/2=48 => c=102-3b

(90-(102-3b)-b)/2/2+b/2+102-3b=51
-5b/2 + 1/4(2b-12) + 102 =51 / *2
-5b + (2b-12)/2+204=102
-5b + (2b-12)/2 = -102
-5b + b-6 = -102
-4b = -96 => 4b=96

b=24
c=102-3b => c=30
a=(90-c-b)/2 => a=18