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a) =(9/5-3 2/7)*5 5/13=(9/5-23/7)*5 5/13= -52/35*5 5/13= - 52/35*70/13= -8
b) =9/5-3 2/7*5 5/13=9/5-23/7*5 5/13=9/5-23/7*70/13=9/5-230/13= -1033/65
c) =(0,4+5/3)(-2)²=(4/10+5/3)(-2)²=(2/5+5/3)(-2)²=31/15(-2)²=31/15*4=124/15=8 4/15
d) =(11/4-3,5)(-2)²=(11/4-35/10)(-2)²=(11/4-7/2)(-2)²= -3/4*(-2)²= - 3/4*4= -3
e) =(9/4+(-1/2)²)²=(9/4+1/4)²=(5/2)²=25/4=6,25
f) = (0,75-9/16)²=(75/100-9/16)²=(3/4-9/16)²=(3/16)²=9/256=0,03515625