We are asked to evaluate the expression: $-1\frac{4}{9} + \frac{7}{9} - \frac{2}{9} + 2\frac{1}{9}$.

ArithmeticFractionsMixed NumbersArithmetic Operations
2025/5/6

1. Problem Description

We are asked to evaluate the expression:
149+7929+219-1\frac{4}{9} + \frac{7}{9} - \frac{2}{9} + 2\frac{1}{9}.

2. Solution Steps

First, we convert the mixed numbers to improper fractions:
149=(1×9)+49=9+49=139-1\frac{4}{9} = -\frac{(1 \times 9) + 4}{9} = -\frac{9+4}{9} = -\frac{13}{9}
219=(2×9)+19=18+19=1992\frac{1}{9} = \frac{(2 \times 9) + 1}{9} = \frac{18+1}{9} = \frac{19}{9}
Now, we rewrite the original expression with the improper fractions:
139+7929+199-\frac{13}{9} + \frac{7}{9} - \frac{2}{9} + \frac{19}{9}
Since all the fractions have the same denominator, we can combine the numerators:
13+72+199\frac{-13 + 7 - 2 + 19}{9}
Now we simplify the numerator:
13+72+19=62+19=8+19=11-13 + 7 - 2 + 19 = -6 - 2 + 19 = -8 + 19 = 11
Therefore, the expression simplifies to:
119\frac{11}{9}
Now we convert the improper fraction back to a mixed number:
119=129\frac{11}{9} = 1\frac{2}{9}

3. Final Answer

1291\frac{2}{9}

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