Pedro cembió de opinión y quiere que su PIN se forme solo con los digitos 2 . 5,7 . repitiendo ed 7 . ¿Cuántas claves diferentes podria formar?

a. \( \frac{1}{4} \cdot \frac{3}{4}= \)

1) \( a=8 \frac{2}{5} \) vo \( b=1 \frac{1}{20} \) olduqda \( 0,2 \cdot(a: b) \) ifadosinin qiymotini tapın. 2) \( a=1 \frac{3}{23} \) vo \( b=4 \frac{5}{23} \) olduqda \( (b: a): 2 \frac{1}{2} \) ifadosinin qiymotini tapın.

17. Without using a calculator evaluate. 18. The lengths of three wires were \( 30 \mathrm{~m}, 36 \mathrm{~m} \) and 84 m . Pieces of wire of equal lenght were cat from the three wires. Calculate the least number of pieces obtained.

Write down the following numbers in standard form. a 640000 b 0.0006

На прополку \( \frac{2}{9} \) поля необходимо 5 дней. Определи, какую часть поля пропалывают за 1 день.