2 2/7 * 2 5/6 - 1 3/4 * 2 2/7 + 2 2/7 * 2/3 = -1
1) 2/7 * 2 5/6 = 2/7 * 17/6(2 и 6 сокращаем на 3) = 17/21
2)1 3/4 * 2 2/7 = 7/4 * 16/7( 7 и 7 сокращаем на 7, 16 и 4 сокращаем на 4) = 4
3)2 2/7 * 2/3 = 23/7 * 2/3= 46/21 = 2 4/21
4 и 5) 17/21 - 4 + 2 4/21 = -3 4/21 + 2 4/21= -1
2 2/7 * 2 5/6 - 1 3/4 * 2 2/7 + 2 2/7 * 2/3 = -1
1) 2/7 * 2 5/6 = 2/7 * 17/6(2 и 6 сокращаем на 3) = 17/21
2)1 3/4 * 2 2/7 = 7/4 * 16/7( 7 и 7 сокращаем на 7, 16 и 4 сокращаем на 4) = 4
3)2 2/7 * 2/3 = 23/7 * 2/3= 46/21 = 2 4/21
4 и 5) 17/21 - 4 + 2 4/21 = -3 4/21 + 2 4/21= -1