bonjour,
-7/5×(2/9-7/18)
2/9 - 7/18 = 4/18 -7/18 = -3/18 = -1/6
-7/5 * -1/6
= 7/ 30
(4/5+-3/2):(-9/4-1/6)
4/5 + 3/2 = 8/10 + 15/10 = 23/10
-9/4 -1/6 = -27/12 - 2/12 = -29/12
(23/10) / ( -29/12)
= 23/10 * -12/29
= -276/ 290
= -138/145
