Question

\(B=13,3+\left(-13,3\right)+7,9\)

Answer 1

\(B=13,3+\left(-13,3\right)+7,9\\ =\left[13,3+\left(-13,3\right)\right]+7,9\\ =0+7,9\\ =7,9\)

Answer 2

7,9

Answer 3

7,9

Answer 4

B = \(13.3+\left(-13.3\right)+7.9\)

B = \(0+7.9\)

B = \(7.9\)

Answer 5

Ta có:

B = 13,3 + (-13,3) + 7,9

    = 13,3 - 13,3 + 7,9

    = 7,9