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2) x²+3xy+xy+3y²=x²+4xy+3y²
3) 6m²-6mn-14mn-14n²=6m²-8mn-14n²
4) 3x²
5) ab²
maaf banget ya kalo salah,soalnya nomor 3 sampe 5 kurang yakin kalo jawabannya itu