Question

5.(-2,3).(-0,6) 532. Вычислите: 3 + 1) : "( 35.0, (+3,8+2});(-15)+43:(-3) (-2,5-1,0) --- 3. :(-21) 8 5 3) 3 1 12 0,75; 2) :1 6 3 4) 3 4 1 3 + 3 4 8 4 97 ​если можно только четвёртое

Answer 1

Ответ:

1)

$( - 3.8 + 2 \frac{1}{3} ) \times ( - 1 \frac{7}{8} ) + 4 \frac{1}{6} \div ( - 1 \frac{2}{3} ) = ( - \frac{38}{10} + \frac{7}{3} ) \times ( - \frac{15}{8} ) + \frac{25}{6} \div ( - \frac{5}{3} ) = ( \frac{ - 114 + 70}{30} ) \times ( - \frac{15}{8} ) + \frac{25}{6} \times ( - \frac{3}{5} ) = - \frac{44}{30} \times ( - \frac{15}{8} ) - \frac{5}{2} = \frac{11}{4} - \frac{5}{2} = \frac{11 - 10}{4} = \frac{1}{4} = 0.25$

2)

$( - 2.5 - 1 \frac{5}{6} ) \div 1 \frac{4}{9} - 3 \frac{5}{9} \times ( - 2 \frac{1}{4} ) = ( - \frac{25}{10} - \frac{11}{6} ) \div \frac{13}{9} - \frac{32}{9} \times ( - \frac{9}{4} ) = ( \frac{ - 75 - 55}{30} ) \times \frac{9}{13} + 8 = - \frac{130}{30} \times \frac{9}{13} + 8 = - 3 + 8 = 5$

3)

$( - \frac{5}{12} - \frac{3}{4} ) \div 2 \frac{1}{3} + 5 \frac{1}{3} \times 0.75 = (\frac{ - 5 - 9}{12} )\div \frac{7}{3} + \frac{16}{3} \times \frac{75}{100} = - \frac{ 14}{12} \times \frac{3}{7} + 4 = - 0.5 + 4 = 3.5$

4)

$( \frac{3}{4} - 1 \frac{7}{8} ) \div \frac{3}{4} + 3 \frac{1}{9} \times \frac{3}{7} = ( \frac{9 - 15}{8} ) \times \frac{4}{3} + \frac{28}{9} \times \frac{3}{7} = - \frac{6}{8} \times \frac{4}{3} + \frac{4}{3} = - 1 + 1 \frac{1}{3} = \frac{1}{3}$