Вопрос:

Evaluate the expression: (2.28 - 1 7/25) : 4/9 - 0.375 : 1/6

Смотреть решения всех заданий с листа

Ответ:

Let's break down the calculation step-by-step:

  1. First, calculate the value inside the parentheses:
    • Convert 2.28 to a fraction: $$2.28 = \frac{228}{100} = \frac{57}{25}$$
    • Convert the mixed number to an improper fraction: $$1 \frac{7}{25} = \frac{(1 \times 25) + 7}{25} = \frac{25 + 7}{25} = \frac{32}{25}$$
    • Now subtract: $$\( \frac{57}{25} - \frac{32}{25} = \frac{25}{25} = 1 \)$$
  2. Perform the division:
    • $$\( 1 : \frac{4}{9} \)$$
    • Dividing by a fraction is the same as multiplying by its reciprocal: $$\( 1 \times \frac{9}{4} = \frac{9}{4} \)$$
  3. Convert 0.375 to a fraction:
    • $$0.375 = \frac{375}{1000}$$
    • Simplify the fraction by dividing both numerator and denominator by their greatest common divisor, which is 125: $$\( \frac{375 \div 125}{1000 \div 125} = \frac{3}{8} \)$$
  4. Perform the second division:
    • $$\( \frac{3}{8} : \frac{1}{6} \)$$
    • Multiply by the reciprocal: $$\( \frac{3}{8} \times \frac{6}{1} \)$$
    • Multiply the numerators and the denominators: $$\( \frac{3 \times 6}{8 \times 1} = \frac{18}{8} \)$$
    • Simplify the fraction: $$\( \frac{18}{8} = \frac{9}{4} \)$$
  5. Finally, subtract the results:
    • $$\( \frac{9}{4} - \frac{9}{4} = 0 \)$$

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