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2. 10ab+3ab²+5ab-3ab²= 15ab
3. 17x+8y-20xy+3x+x-2y= -20xy+21x+6y
4. 8xy+10xy+3xy+7x²y+4xy= 7x²y+25xy
5. 0,3ab-a²+2ab-0,7a+a= -a²+2,3ab+0,7a