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2.3x²-y²
3.5m²-4
4.2p²-4q²
5. 2a²-12
B. 1.a²b + 2ab²-abc
. 2.5x²y -3xy²+25xy
3.15a²b -10a²c
. 4.2x²y - 6xy²
5.12y²x -12y²z