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Stiind ca a+2b+3c=811, a + c=339 aflați a-b​=?

Răspuns :

a+c=339
2b+2c+339=811
2b+2c=811-339
2b+2c=472
b+c=472÷2
b+c=236
a+c=339
b+c=236
a+2b+c=575
2b=575-339
b=236÷2=118
c=236-118
c=118
a+c=339
a=339-118
a=221