\(-\frac{9}{22}+\frac{5}{31}+\frac{-13}{22}+\frac{88}{31}+\frac{1}{2}\)
\(=-1+3+\frac{1}{2}\)
\(=2+\frac{1}{2}\)
\(=\frac{5}{2}\)
= \(\left(\frac{-9}{22}+\frac{-13}{22}\right)+\left(\frac{5}{31}+2\frac{26}{31}\right)+0,5\)
= \(-1+3+0,5\)
= \(2+0,5\)
= \(2,5\)
k mik nhé
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