Question

Tìm 3 số a, b, c biết : a+b=30, b+c=37, c+a=33

Answer 1

Ta có: a + b = 30; b + c = 37; c + a = 33

=> (a + b) + (b + c) - (c + a) = 30 + 37 - 33

=> a + b + b + c - c - a = 34

=> 2b = 34

=> b = 17

=> a = 30 - b = 30 - 17 = 13

c = 37 - b = 37 - 17 = 20

Answer 2

Ta có: a + b = 30; b + c = 37; c + a = 33 => (a + b) + (b + c) - (c + a) = 30 + 37 - 33 => a + b + b + c - c - a = 34 => 2b = 34 => b = 17 => a = 30 - b = 30 - 17 = 13 c = 37 - b = 37 - 17 = 20

Answer 3

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