Выполните вычисления: (-2/7)^2+1 45/49= 1,2*5/6-1 1/3= 0,3:0,2+ 1/6= (-7)^7+(-1)^9=

1) (-2/7)^2 + 1 45/49 = (-2/7) * (-2/7) + (1 * 49 + 45)/49 = (2 * 2)/(7 * 7) + (49 + 45)/49 = 4/49 + 94/49 = (4 + 94)/49 = 98/49 = 2;

2) 1,2 * 5/6 - 1 1/3 = 12/10 * 5/6 - (1 * 3 + 1)/3 = (12 * 5)/(10 * 6) - 4/3 = 1 - 4/3 = 3/3 - 4/3 = -1/3;

3) 0,3 : 0,2 + 1/6 = 3/10 : 2/10 + 1/6 = 3/10 * 10/2 + 1/6 = 3/2 + 1/6 = 9/6 + 1/6 = 10/6 = 5/3;

4) (-7)^7 + (-1)^9 = - 7^7 - 1.