Question

Выполните действия:
а) 4 3/8 - (6, 8 + 2 3/4);
б) 0, 75 - (0, 125 + 3/4);
в) (4/15+ 0,3) - (1 - 3/20);​

Answer 1

Ответ:

а) $4\frac{3}{8} - (6,8 + 2\frac{3}{4} ) = \frac{35}{8} - ( \frac{68}{10} + \frac{11}{4} ) = \frac{35}{8} - ( \frac{136}{20} + \frac{55}{20} ) = \frac{35}{8} -\frac{191}{20} =\frac{175}{40} -\frac{382}{40} =-\frac{207}{40} = -5\frac{7}{40} = -5,175$

б) 0,75 - ( 0,125 + 3/4 ) = 0,75 - 0,125 - 0,75 = -0,125

в) ( 4/15 + 0,3 ) - ( 1 - 3/20 ) = ( 4/15 + 3/10 ) - ( 20/20 - 3/20 ) = ( 8/30 + 9/30 ) - 17/20 = 17/30 - 17/20 = 34/60 - 51/60 = -17/60 ≈ -0,283