Bonjour,
Ex 5.5:
B=(2/3)-(4/3)×(5/2)
B=(2/3)-(20/6)
B=(4/6)-(20/6)
B=-(16/6)
B=-8/3
C=5+(1+1/8)/(3/4)
C=5+(1+1/8)(4/3)
C=5+(8/8+1/8)(4/3)
C=5+(9/8)(4/3)
C=5+36/24
C=120/24+36/24
C=156/24
C=(13×12)/(2×12)
C=13/2
Ex5.6:
1) A=(12/5)-(5/3)(7/9)
A= (12/5)-(35/27)
A=(324/135)-(175/135)
A=149/135
2) B=(2/3-3)/(1/9)
B=9(2/3-3)
B=9(2/3-9/3)
B=9×(-18/3)
B=-6×9
B=-54