Выполни умножение дробей 1. 19/42*21/38= 2.24/66*39/40= 3. 25/36*51/70= 4. 7/16*8/49= 5. 4/7*8/9= 6. 56/69*69/77= 7. 39/86*43/78= 9. 50/65*40/75= 8. 8/25*5/56= 9. 29/69*23/58= 10. 88/93*63/77= 11. 27/64*56/57= 12. 5/9*7/8=