a) 2/25 + 23/25 - 1/4020 + 1/19 - 4/19 - 5/1= (2 + 23 - 1 - 4 - 5)/25 - 1/402= 15/25 - 1/402= 3/5 - 1/402= (2412 - 1)/402= 2411/4020
b) 37 7/200 + x = 39 4/20x = (39 4/200) - (37 7/200x = 39 + 4/200 - 37 - 7/20x = (39 - 37) + (4 - 7)/20x = 2 + (-3)/20x = 2 - 3/20x = 199/100
c) (24 4/25 - x) - 17 6/25 = 2 23/224 + 4/25 - x - 17 - 6/25 = 2 + 23/224 - 17 + 4/25 - 6/25 - x = 2 + 23/27 + (4 - 6)/25 - x = 2 + 23/27 - 2/25 - x = 2 + 23/27 - 2/25 - x = 2 + 23/27 - 2/25 - x = 2 + 23/27 - 2/25 - x = 2 + 23/2x = 7 - 1 - 2/25 + 23/2x = 6 + 21/2x = (150 + 21)/2x = 171/25
a) 2/25 + 23/25 - 1/4020 + 1/19 - 4/19 - 5/1
= (2 + 23 - 1 - 4 - 5)/25 - 1/402
= 15/25 - 1/402
= 3/5 - 1/402
= (2412 - 1)/402
= 2411/4020
b) 37 7/200 + x = 39 4/20
x = (39 4/200) - (37 7/200
x = 39 + 4/200 - 37 - 7/20
x = (39 - 37) + (4 - 7)/20
x = 2 + (-3)/20
x = 2 - 3/20
x = 199/100
c) (24 4/25 - x) - 17 6/25 = 2 23/2
24 + 4/25 - x - 17 - 6/25 = 2 + 23/2
24 - 17 + 4/25 - 6/25 - x = 2 + 23/2
7 + (4 - 6)/25 - x = 2 + 23/2
7 - 2/25 - x = 2 + 23/2
7 - 2/25 - x = 2 + 23/2
7 - 2/25 - x = 2 + 23/2
7 - 2/25 - x = 2 + 23/2
x = 7 - 1 - 2/25 + 23/2
x = 6 + 21/2
x = (150 + 21)/2
x = 171/25