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=0,333333333+(-1) =-0,666666666
b. 3/7 - 2 1/2
=0,428571428-1 =-0,571428571
c. 3/8 - 4/5
=0,375-0,8 =-0,425
d. 3 2/3 - 2 1/4
=1-0,5 =0,5