A = inverse de 20/12 = 12/20 = 3/5
B = 1 + 2/10 = ( 10 + 2) /10 = 12/10 = 6 /5
C = 6/5 x 1/2 = 6 /10 = 3 /5 , inverse = 5/3
D = 1/4 x 1/3 x 24 = 24 * 1/12 = 2
E = - 5/8 x 25/8 = 20/8 = 5/2
F = 30/10 = 3
G = 5/2 + 5/6 = 15/6 + 5/6 = 21/6
H = 22 x 3/18 = 66/18 = 11 /3
i = 56/4 x 1/3 = 56/12 = 14/3
J = 9/5 * 5/4 = 45/20 = 9 /4
k = 1/3 * 1/3 * 33 = 1/9 * 33 = 33/9 = 11/3
L = 35/10
M = 24/3 x 1/2 = 24/6 = 4
N = - 35/- 9 - 2 /9 = - 37/9
O = - 3/6 - ( - 35/6 ) = - 3/6 + 35/6 = 32/6 = 16/3
P = ( 7/8 + 3 /8 ) : ( 1 - 1/2 )
= 10 /8 ; ( 2/2 - 1 /2 )
= 10/8 : 1 /2 = 10/8 * 2 = 20/8 = 5 /2
Q = 2 * 1/4 * 1/3 * 24 = 48/12 = 4
R = 3 *3/4 = 9/4
S = 12/4 - 1/4 = 11/4
T = 4 * 30/2 = 120/2 = 60 inverse = 1 /60
U = 18/6 : ( 6/3 - 4/3 )
= 18/6 : 2 /3
= 18/6 * 3 /2
= 54/12
= 27/6
