а)х^2+8x+16-7x=х^2+x+16
б)с^2-2c+1-1+2c=c^2
в)x^2-2xy+y^2+xy-x^2=-xy+y^2
г)a^2+2ab+b^2-2ab+2b^2=a^2+3b^2
д)9m^2-(n^2-6mn+9m^2)=9m^2-n^2+6mn-9m^2=-n^2+6mn
е)a^2+b^2-a^2+2ab-b^2=2ab
ж)5z-z^2+z^2-10z+25=-5z+25
з)3u^2+6u-u^2-6u-9=2u^2-9
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Answers & Comments
а)х^2+8x+16-7x=х^2+x+16
б)с^2-2c+1-1+2c=c^2
в)x^2-2xy+y^2+xy-x^2=-xy+y^2
г)a^2+2ab+b^2-2ab+2b^2=a^2+3b^2
д)9m^2-(n^2-6mn+9m^2)=9m^2-n^2+6mn-9m^2=-n^2+6mn
е)a^2+b^2-a^2+2ab-b^2=2ab
ж)5z-z^2+z^2-10z+25=-5z+25
з)3u^2+6u-u^2-6u-9=2u^2-9