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Ajutati-ma!!!
a+b=857
a-b=343
a=?   b=?



Răspuns :

a + b = 857
a - b = 343 => a = 343 + b
Deci a + b = 857 => (343 + b) + b = 857 => 343 + 2b = 857 => 2b = 514 => b = 257
           Iar a = 343 + b = 343 + 257 => a = 600
a+b= 857
a= b+343

857- 343=514
514:2=257 (b)
257+343=600 (a)