Sagot :
A = 2/3-2/3x9/5 = 2/3 – 18/15 = 10/15 – 18/15 = -8/15
A= -8/15
B= (1/6-1/3) : (2/5x3/4) = (1/6-2/6) : (6/20) =( -1/6) : (3/10) = -1/6*10/3 = -10/18 = -5/9
B = -5/9
B-A = -5/9 – (-8/15) = - 5/9 + 8/15 = -75/135 + 72/135 = -3/135 = -1/45
AB = (-8/15)x ( -5/9) = + 40/135 = 8/27
A/B = (-8/15)/( -5/9) = (-8/15)x (-9/5)= +72/75 = 24/25
Ensuite pour le 3, j'avoue ne pas trop être sûre...
3/ -8/15 + (-9/5) = -8/15 -27/15 = - 35/15 = -7/3 ??
A= -8/15
B= (1/6-1/3) : (2/5x3/4) = (1/6-2/6) : (6/20) =( -1/6) : (3/10) = -1/6*10/3 = -10/18 = -5/9
B = -5/9
B-A = -5/9 – (-8/15) = - 5/9 + 8/15 = -75/135 + 72/135 = -3/135 = -1/45
AB = (-8/15)x ( -5/9) = + 40/135 = 8/27
A/B = (-8/15)/( -5/9) = (-8/15)x (-9/5)= +72/75 = 24/25
Ensuite pour le 3, j'avoue ne pas trop être sûre...
3/ -8/15 + (-9/5) = -8/15 -27/15 = - 35/15 = -7/3 ??