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) 999 =(1000-1)2 =10002-2.1000.1+12 =1000000-2000+1 =1000001-2000 =980001) 55 = (50+5)2 =(50)2+2.50.5+52 =2500+500+25 =3025

1.(a+b)2=a2+2ab+b22.(a-b)2=a2-2ab+b23.(a+b+c)2=(a2+b2+c2)+2(ab+bc+ca)4.a2+b2+c2=(a+b+c)2-2(ab+bc+ca)5.2(ab+bc+ca)=(a+b+c)2-(a2+b2+c2)6.a2-b2=(a+b)(a-b) ,,,