Объяснение:
1
(х+b)^2=x^2+2xb+b^2
2
(k+m)=k^2+2km+m^2
3
(3n-1)=9n^2-6n+1
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Объяснение:
1
(х+b)^2=x^2+2xb+b^2
2
(k+m)=k^2+2km+m^2
3
(3n-1)=9n^2-6n+1