1) (2/7+3'1/2)×4'2/3
2) (4'1/5-2'3/4)×2'2/19
3) (5'6/7+3'5/21)×2'1/10
4) (7'5/12-3'1/6)×2'2/17
С РЕШЕНИЕМ
'-это целое
/-это дробь

Пошаговое объяснение:

1) (2/7+3 1/2)×4  2/3 = (4/14+3 7/14)* 14/3 = 3 11/14 * 14/3= 53/14*14/3 =

=53/3=17 2/3;

2) (4'1/5-2'3/4)×2'2/19 = (4 4/20 -2 15/20)*40/19 = 2 (4-15)/20 * 40/19=

=1 (24-15)/20 * 40/19 = 1 9/20 * 40/19 = 29/20 * 40/19 = 58/19=3 1/19;

3) (5'6/7+3'5/21)×2'1/10 = (5 18/21+3 5/21) * 21/10 = 8 23/21 * 21/10 =

=1052/21 * 21/10 = 1052/10 = 105.2;

4) (7'5/12-3'1/6)×2'2/17 = (7 5/12 - 3 2/12) * 36/17 = 4 3/12 * 36/17 =

=51/12 * 36/17 = 9.