Bonsoir,
(1/3 - 1/5) ÷ (2/7) - (2 - 7/10)
(1/3 - 1/5) = 5/15 - 3/15 = 2/15
(2 - 7/10) = 20/10-7/10= 13/10
(1/3 - 1/5) ÷ (2/7) - (2 - 7/10)
(2/15 )/ ( [2/7) - (13/10)]
( [2/7) - (13/10)]
= 20/70 -91/70
= 71/10
(2/15) / ( (71/10)
= 2/15 * 10/71
= 20/1065
= 4/213