АМ=АС:2=114:2=57
AB²=AM²+BM²
BM=√AB²-AM²
BM=76
А=х, в=х+8,с=х+4, Х+х+8+х+4=54, 3х+12=54,
2/7 :8 + 5/0,7 - 3/4 :21 = 7целых 1/7
1) 2/7 : 8 = 2/7 * 1/8=2/56=1/28
2) 5 : 7/10 = 5 * 10/7 = 50/7
3) 3/4 : 21 = 3/4 * 1/21=1/28
4) 1/28 + 50/7 = 1/28 + 200/28 = 201/28
5) 201/28 - 1/28 = 200/28 =50/7 = 7 целых 1/7
Дуга окружности. 100% не диаметр и радиус