Sagot :
C= -16/7 + 4/-5 x -4/3
C= -16/7 + 4*-4 /-5*3
C = -16/7 + 16/15
C = -16*15 / 7*15 + 16*7 / 15*7
C = -240/105 + 112/105
C = -128/105
D= -9/7 -(1/3 + -4/5)
D= -9/7 - (1*5 / 3*5 + -4*3 / 5*3)
D = -9/7 - (5-12/15)
D= -9/7 + 7/15
D = -9*15 / 7*15 + 7*7 / 15*7
D = -135/105 + 49/105
D= -86/105