А) x + 3.8 = 2.7
x = 2.7 - 3.8
x = -1,1
б) 7.1 + y = -1.8
y = -1.8 - 7.1
y = -8.9
в) - 1.2 - a = 3; | * (-1)
1.2 + a = -3;
a = -3 - 1.2
a = -4.2
г) b - 2.2 = -3.3 | * (-1)
2.2 - b = 3.3
b = 2.2 - 3.2
b = -1.1
д) z - 1/3 = -7/12
z = 4/12 - 7/12
z = - 3/12
е) 3 5/7 = 26/7 = 78/21
2 8/21 = 50/21
m = 50/21 - 78/21
m = -28/21 = -1 7/21 = -1 1/3 (минус одна целая одна третья)