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A. -3a-2
B. 10b-7
C. 4,5n²-7n
D. -8
E. 3⅓x²+3½
F. 2,5p²+7,5p-1,5
5.
A. ½a²-1½a+3
B. ½a²-a+4
C. ½a²-1½a+9