a) 3,45 - 2,5 + x = 1,78
0,95 + x = 1,78
x = 1,78 - 0,95
x = 0,83
b) X x 1,2 + X x 1,8 = 45
X x (1,2 + 1,8) = 45
X x 3 = 45
X = 45 : 3
X = 15
a) 3,45 - 2,5 + x = 1,78
0,95 + x = 1,78
x = 1,78 - 0,95
x = 0,83
b) x . 1,2 + x, 1,8 = 45
x . ( 1,2 + 1,8 ) = 45
x . 3 = 45
x = 45 : 3
x = 15
a) 3.45 -2.5 + x = 1.78
0.95 + x= 1.78
x = 1.78-0.95
x = 0.83
b) x * 1.2 + x*1.8 = 45
x*(1.2+1.8) = 45
x*3=45
x = 45:3
x = 15
B, x * 1,2 + x * 1,8 = 45
x * (1.2+1.8)= 45
x* 2=45
x=45/2
x=22.5
A, 3,45 - 2.5 + x = 1.78
2.5+x=3.45+1.78
2.5+x=5.23
x=5.23-2.5
x=2.73
a) 3,45-2,5+x=1,78
0,95+x = 1,78
x = 1,78-0,95
x = 0,83
b) X * 1,2 + x * 1,8 = 45
X * (1,8+1,2) = 45
X * 3 = 45
X = 45:3
X = 15