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B. (4m² + 4m + n ²) + (m+2n+1) = 4m² + n² + 5m +2n +1
C. 3a +2 + (-4a² +1) = -4a² +3a +3
D. (25X² +10X + 1) - (25x² -10X + 1) = 25X² +10X +1 -25X²+10X-1 = 20X
gini ya...