7 дес. 6 ед. = 7 * 10 + 6 = 70 + 6 = 76
8 дес. 1 ед. = 8 * 10 + 1 = 80 + 1 = 81
10 дес. 0 ед. = 10 * 10 + 0 = 100 + 0 = 100
4 дес. 7 ед. = 4 * 10 + 7 = 40 + 7 = 47
5 дес. 5 ед. = 5 * 10 + 5 = 50 + 5 = 55
8 дес. 2 ед. = 8 * 10 + 2 = 80 + 2 = 82
9 дес. 3 ед. = 9 * 10 + 3 = 90 + 3 = 93
9 дес. 0 ед. = 9 * 10 + 0 = 90 + 0 = 90
7 дес. 7 ед. = 7 * 10 + 7 = 70 + 7 = 77
М = 1000
С = 100
D = 500
L = 50
X = 10
MMMCD = 1000 + 1000 + 1000 + (500 - 100) =3400
CLXXX = 100 + 50 + 10 + 10 + 10 = 180
3400 - 180 = 3220
Ответ: 3220.
1)17 _1/7+36_6/7=233/7;
2)6_1/9+4_5/6=4;
3)5_6/7+2_4/5+48/21=778/105;
4)10+5_11/36-8_3/8=307/$6;
5.12 ))))))))))))))))))))))))))))
64/100 =0.64(1 процент)
0.64 • 8 = 5.12