(10*0.9-0.9*8)+(8*0.8-0.8*6)+(6*0.7-0.7*4)+(4*0.6-0.6*2) решите рациональным способом

1. 0.9=9//102. 10*(9//10)=93. 0.9=9//104. (9//10)*8=(36//5)5. 9-(36//5)=(9//5)6. 0.8=8//107. 8//10=4//58. 8*(4//5)=(32//5)9. (9//5)+(32//5)=(41//5)10. 0.8=8//1011. 8//10=4//512. (4//5)*6=(24//5)13. (41//5)-(24//5)=(17//5)14. 0.7=7//1015. 6*(7//10)=(21//5)16. (17//5)+(21//5)=(38//5)17. 0.7=7//1018. (7//10)*4=(14//5)19. (38//5)-(14//5)=(24//5)20. 0.6=6//1021. 6//10=3//522. 4*(3//5)=(12//5)23. (24//5)+(12//5)=(36//5)24. 0.6=6//1025. 6//10=3//526. (3//5)*2=(6//5)27. (36//5)-(6//5)=6

Ответ:6