bonjour pouver vous me faire cette operation svp 1-( un tier + un quart)x deux cinquieme

1 - (1/3 + 1/4) x 2/5
= 1 - (1 x 4 / 3 x 4 + 1 x 3 / 4 x 3) x 2/5
= 1 - (4/12 + 3/12) x 2/5
= 1 - 7/12 x 2/5
= 1 - 14/60
= 1 x 60 / 1 x 60 - 14/60
= 60/60 - 14/60
= 46/60
= 2 x 23 / 2 x 30
= 23/30