А) 4 11/18 * 6/7 = 83/18 * 6/7 = (83*1)/(3*7) = 83/21 = 3 20/21
б) (1 1/2)^3 - 2 1/4 * 1 1/3 = 3/8
1) 1 1/2 * 1 1/2 * 1 1/2 = 3/2 * 3/2 * 3/2 = 27/8 = 3 3/8
2) 2 1/4 * 1 1/3 = 9/4 * 4/3 = 9/3 = 3
3) 3 3/8 - 3 = 3/8
А)-66+75-33+66=-66+66+75-33=0+42=42
б)-3/7*5/13-4/7*5/13=5/13(-3/7-4/7)=5/13*(-1)=-5/13
в)-13,8+2,4-(2,9-13,8)=-13,8+2,4-2,9+13,8=0-0,5=-0,5
Смотрите фото в приложении
12-8=4, 20-8=12, 28-8=20, 43-8=35
12+10=22, 20+10=30, 28+10=38, 43+10=53