Question

Решите по действия плзл дам 40 баллов ​

Answer 1

$a)( \frac{2}{15} + \frac{19}{12} ) \times \frac{30}{103} - (1 \div \frac{9}{4} ) \times ( - \frac{9}{16} ) = \frac{103}{60} \times \frac{30}{103} - (1 \div \frac{9}{4} ) \times ( - \frac{9}{16} ) = \frac{103}{60} \times \frac{30}{103} - \frac{4}{9} \times ( - \frac{9}{16} ) = \frac{1}{60} \times 30 + \frac{4}{9} \times \frac{9}{16} = \frac{1}{2} + \frac{4}{9} \times \frac{9}{16} = \frac{1}{2} + 4 \times \frac{1}{16} = \frac{1}{2} + \frac{1}{4} = \frac{3}{4} = 0.75$

$b) \frac{3}{25} \times ( - \frac{5}{49} ) + \frac{22}{25} \times ( - \frac{5}{49} ) = - \frac{3}{25} \times \frac{5}{49} + \frac{22}{25} \times ( - \frac{5}{49} ) = - \frac{3}{25} \times \frac{5}{49} - \frac{22}{25} \times \frac{5}{49} = - \frac{3}{5} \times \frac{1}{49} - \frac{22}{25} \times \frac{5}{49} = - \frac{3}{5} \times \frac{1}{49} - \frac{22}{5} \times \frac{1}{49} = - \frac{3}{245} - \frac{22}{5} \times \frac{1}{49} = - \frac{3}{245} - \frac{22}{245} = - \frac{5}{49}$

б)если в десятковом виде то =-0,102