Question

POR FAVOR QUANDO FIZER ESCREVER EM PAPEL!

Answer 1

a
( 1/1 - 7/8 ) / ( - 3/4)
[( 8 - 7)/8 ] / ( - 3/4 )
[  1/8 ] / [ -3/4]  =    (1/8) * ( -4/3) = - 4/24 = - 1/6 ***

b
( -5/6 - 1/4 ) / ( 1/1 + 1/2)
[( -10 - 3)/12]/ [ ( 2 + 1)/2] =
[ -13/12 ] / [ 3/2]  =
( -13/12 ) * ( 3 /2 )  = -13/12 * 2/3 = -26/36 = - 13/18 *****

c
( -1/1 + 1/7) / ( 1/3 - 3/2) =
[( -7 + 1)/7 ]/ [ ( 2 - 9 )/6 ] =
( -6/7 ) / ( -7/6 ) =
( -6/7 ) * ( - 7/6)  = 42/42 = 1 ****