a) -12,4 - 2,4: (-2 2/3) + 2 2/3• (-0,9)- 0,1= b)0,024 • (-3 1/3) : 0,004 -[- 1 1/7 • (-5 5/8 + 2 1/8 : 1,7)] = c)40 - 20 4/7 : [ -0,12 + (-3/4) : 12,5 ] • (-1,4) =

a) -12,4 - 2,4: (-2 2/3) + 2 2/3• (-0,9)- 0,1= =-12,4-24/10:(-8/3)+8/3•(-9/10)-0,1= =-12,4-12/5•(-3/8)-2,4-0,1= =-14,9+0,9=-14 b)0,024 • (-3 1/3) : 0,004 -[- 1 1/7 • (-5 5/8 + 2 1/8 : 1,7)] = =24/100•(-10/3):4/1000-[-8/7•(-45/8+17/8•10/17)= =-8/10•1000/4-[-8/7•(-45/8+10/8)= =-200-[-8/7•(-35/8)]= =-200-5=-205 c)40 - 20 4/7 : [ -0,12 + (-3/4) : 12,5 ] • (-1,4) = =40-144/7:[-12/100+(-3/4):125/10]•(-14/10)= =40-144/7:[-12/100+(-3/4)•10/125]•(-14/10)= =40-144/7:(-12/100-6/100)•(-14/10)= =40-144/7:(-18/100)•(-14/100)= =40-144/7•(-100/18)•(-14/100)= =40+800/7•(-14/100)= =40-16=24