A = 2 x (-3/5) = - 6/5  rien à simplifier

B = -3/4 x 2/1 = -(3x2)/(4x1) = -(3x2) / (2x2x1) = -3/2 - simplification par 2

C = 7/2 x (-1/5) = -7/10 rien à simplifier

et D = -4 x 5/3 = -20/3 - rien à simplifier

Verified answer

bonjour

a)2÷(-5/3)=2x-3/5=2x-3/5=-6/5

b)-3/4÷1/2=-3/4x2/1=-3x2/4x1=-6/4=-3/2

c)7/2÷(-5)=7/2x-1/5=7x-1/2x5=-7/10

d)-4÷3/5=-4x5/3=-4x5/3=-20/3