svp aidez moi c pour demain merci

(1+5/3) : (2-1/7)

= (3/3+5/3) : (14/7-1/7)
= 8/3 : 13/7
= 8/3 * 7/13
= 56/39
= environ 1,44

(-3/4 + 5/6) : -7/8
= (-9/12 + 10/12) : -7/8
= 1/12 : -7/8
= 1/12 * -8/7
= -8/84
= -2/21
= -0,09524