Calcule les expressions suivantes lorsque: a=2/3;b=-3/2;c=-3/4 b.-2a+4b-5c c.6b-3a+5 petit 2 au dessus de b e.a+c/a-b

b. -2(2/3)+4(-3/2)-5(-3/4)
=(-4/3)-6+15/4=(-16/12)-(72/12)+45/12
=(-88/12)+45/12
=(-43/12)

c. 6(-3/2)^2-3(2/3)+5
=6(9/4)-2+5
=(27/2)+3
=(27/2)+(6/2)
=(33/2)

e. (2/3)+(-3/4)/(2/3)-(-3/2)
=(2/3)-(3/4)*(3/2)+(3/2)
=(2/3)-(9/8)+(3/2)
=(16/24)-(27/24)+(36/24)
=(52/24)-(27/24)
=(25/24)